Formulation of Monetary Policy by the Federal Reserve: Rules vs. Discretion

CRS Report for Congress
Formulation of Monetary Policy
by the Federal Reserve:
Rules vs. Discretion
July 19, 2001
Marc Labonte
Government and Finance Division

Congressional Research Service The Library of Congress

Formulating Monetary Policy: Rules vs. Discretion
Would the economy be better off if the responsibility for setting the federal funds
rate were taken from Federal Reserve (Fed) Chairman Alan Greenspan and his
colleagues on the Federal Open Market Committee (FOMC) and replaced by a simple
rule? A surprising number of economists would answer yes. John Taylor, now an
Undersecretary of the Treasury, formulated what is now called the “Taylor rule” in
which interest rate changes would automatically be based on gaps between inflation
and growth and their desired or sustainable long-run rates.
Some Members of Congress have expressed a dissatisfaction with the Fed’s use
of discretion, and have sought alternative policy options; rules offer one alternative.
Although day-to-day control of monetary policy has been delegated to the Fed, the
ultimate goals are determined by Congress. Thus, Congress retains the right to
change the current personal, discretionary regime to a monetary policy based on a
formula incorporated in a rule.
Proponents of using a rule such as the Taylor rule argue that basing policy on
explicit, quantitative goals would promote economic efficiency and individual decision
making because it would eliminate monetary policy “surprises” inherent in the
informal discretionary process now in place. Rule proponents point to the 1970s
when they believe poorly executed discretionary policy led to double-digit inflation
despite sluggish economic growth. They attribute this to the Fed’s unwillingness to
accept slower short-term growth for the sake of price stability and to resist “fine-
tuning” policy in the pursuit of unrealistic goals. The steps ultimately taken to regain
control over the resulting inflation caused the worst recession since the Great
Depression. It is argued that if the Fed’s credibility had not been so low by this point,
inflation could have been eliminated with a much milder recession.
Under a rule, necessary but politically unpopular decisions would be automatic
– inflation could no longer drift upward in pursuit of temporary employment gains.
Switching to a rule could reduce uncertainty, enhance credibility and accountability,
and improve monetary policy effectiveness. To those who see the current regime as
undemocratic, rules offer a way to limit the discretionary power of the unelected
Defenders of discretionary policymaking argue that setting monetary policy in
a highly complex economy cannot be reduced to a single equation. They point out
that this is especially true at times of financial crisis, when the Fed’s ability to increase
financial liquidity is instrumental for quelling panic. Discretionary policy may have
been executed poorly in the 1970s, but the 1990s economy has enjoyed low inflation
and high, stable economic growth. They also question the real-world usefulness of
the simple models that rule proponents use to demonstrate the superiority of Taylor
rules. There are a number of practical problems that would arise if a Taylor rule were
implemented. These include lags in the effectiveness of monetary policy,
shortcomings with economic data, and uncertainty about key economic variables such
as the natural growth rate. There are no plans to update this report.

The Present Discretionary Policy Regime..............................1
The Policy Rule Critique..........................................3
The “Taylor Rule”...........................................3
Different Views on Policy Rules.............................6
Arguments in Favor of Rules.......................................7
Prevents Short-Term Policymaking..............................7
Reduces Uncertainty / Enhances Decision Making...................9
Credibility Enhances the Effectiveness of Monetary Policy.............9
Increased Accountability / Clarification of Policy Goals..............10
Can Prevent “Fine Tuning”...................................12
Non-Economic Considerations.................................13
Criticisms of Policy Rules........................................14
Does Alan Greenspan Obviate the Need for a Policy Rule?............14
Could the Fed Quell a Financial Panic Under a Policy Rule?...........15
Problems with Lags.........................................17
Problems with Data Collection.................................17
Model Uncertainty..........................................18
How Fast Can the Economy Grow?.............................20
Comparing the Taylor Rule to Other Policy Regimes....................21
Inflation Targeting......................................21
Nominal GDP Targeting..................................22
The Gold Standard......................................23
Appendix: The History of Monetary Policy Rules......................26
Friedman’s Money Supply Rule................................26
The Rational Expectations Revolution...........................27

Formulating Monetary Policy: Rules vs.
Under the chairmanship of Federal Reserve (Fed) Chairman Alan Greenspan,
monetary policy has arguably enjoyed an unprecedented record of success and
popularity. His ability to diagnose the economy’s needs and adjust monetary policy
accordingly has won him a reputation with the press for being “omniscient” and
“infallible.” For that reason, it may be surprising that economic literature is replete
with suggestions for monetary policy “rules,” or quantitative formulas. This literature
suggests a very different policy regime than the discretionary regime that operates at
present. It would shift monetary policy away from the informal, personalized
decision-making process that the Fed now employs and towards more structured,
codified, predictable decision making. This report explores the historical evolution
of policy rules and the arguments employed for and against a rule-based policy
Some members of Congress have expressed a dissatisfaction with the Fed’s use
of discretion, and have sought alternative policy options. Rules offer one alternative,
but may have costs of their own worth considering. Although day-to-day control of
monetary policy has been delegated to the Fed, the ultimate goals and structure of the
Fed are the prerogative of Congress. Thus, Congress retains the right to change the
current personal, discretionary regime to a rule-based regime.
The Present Discretionary Policy Regime
If the lessons of macroeconomic stabilization policy were to be stated in one
sentence, that sentence would likely be “while there may be a short-run tradeoff
between unemployment and inflation, there is no long-run tradeoff.” In the long run,
overall unemployment is determined by microeconomic conditions in the labor market
and inflation is caused by excessive money creation by the Federal Reserve (Fed). But
in the short run, monetary policy affects the business cycle, and there is strong reverse
correlation between growth and unemployment. The task of monetary policy is to
attempt to maintain a balance between this short-run tradeoff and the long-run
“neutrality” of money.1
Monetary policy is conducted primarily through the targeting of the federal funds
rate, the overnight inter-bank interest rate. Influencing this rate changes the
availability of credit in financial markets. The Federal Reserve’s Open Market
Committee (FOMC) selects a target rate it believes to be appropriate for economic

1See U.S. Library of Congress, Congressional Research Service, Inflation and
Unemployment: What Is the Connection? by Brian Cashell, CRS Report RL30391 and
Monetary Policy: Current Policy and Conditions, by Gail Makinen, CRS Report RL30354.

conditions and maintains it through the purchase and sale of U.S. Treasury securities.
The FOMC has eight scheduled meetings a year to determine whether the prevailing
interest rate target remains appropriate given the economic environment, or whether
it should be altered. It makes this decision in a private meeting, and releases a joint
communique at the end of the meeting explaining its decision. If the Chairman of the
Fed wants the FOMC to consider changing interest rates between scheduled meetings,
he can call unscheduled meetings at any time. Chairman Greenspan did so twice in2
the first four months of 2001.
There are rarely easy answers in determining the correct monetary policy stance
for three reasons. First, monetary policy influences the most crucial variables –
inflation and output growth – very indirectly. This is because these variables respond
to interest changes in unpredictable ways after long time lags. Second, the variables
that the Fed can control directly – short-term interest rates, the money supply, the
exchange rate, the price of gold – are only meaningful if they are closely, promptly,
and predictably related to overall economic stability. It would be difficult to
demonstrate that any of these variables have this relationship. Third, the Fed can
choose only one policy tool at a time, so it can influence only one policy variable. Yet
it is concerned with at least two variables, inflation and output growth. Hence,
pursuing more than one goal involves tradeoffs in the effectiveness that either variable
can be influenced. (If more goals are added, then its influence over each goal is
diluted further.) Since monetary policy influences output growth more quickly than
inflation, but is believed to have no permanent effect on output growth, in many ways
this is a tradeoff of short run benefits and long run costs. For these three reasons, the
current system is highly reliant on the judgement of FOMC members in determining
the correct policy stance.
The FOMC bases its interest rate decisions on the mandate set forth by the
Federal Reserve Reform Act of 1977 (P.L. 95-188). This act calls for the Fed to
maintain maximum employment, stable prices, and moderate interest rates – but does
not define what those goals are quantitatively.3 These goals are legally stipulated in
such a way that the Fed has considerable latitude in reaching its decisions – nearly any
policy stance can be justified by appealing to one of its mandated goals. Its
descriptions of its policy motivations are qualitative, rather than quantitative, and thus
they cannot be judged against an objective standard by outsiders. There is a cottage
industry of private economic forecasters, hired by businesses to aid their investment
planning, who try to predict what the Fed will do next. While the forecasters are
frequently accurate, since the Fed’s decision-making process is discretionary, at some
level these forecasts are akin to reading tea leaves.

2For an overview, see U.S. Library of Congress, Congressional Research Service, Monetary
Policy: Current Policy and Conditions, by Gail Makinen, CRS report RL30354.
3The 1978 Humphrey-Hawkins Act (P.L. 95-523) sets numerous goals for the overall federal
government. It requires the Fed to report to Congress semi-annually to explain how Fed
policy is contributing to the achievement of these goals. For more information, see U.S.
Library of Congress, Congressional Research Service, Redefining the Federal Reserve’s
Monetary Policy Mandate, by Thomas Woodward, CRS report 95-394E.

The Policy Rule Critique
The current policy regime remains a source of dissatisfaction to many
economists. This is not because they necessarily believe that the Fed has performed
poorly in the last decade, but rather because they believe that there have been times
in the past – most recently in the 1970s – when that was the case. Thus, they argue,
mechanisms should be put in place to prevent a return to the “bad old days.” They
argue that many of the Fed’s decisions in the 1970s were made for small short-term
gains at the price of large long-term losses.
In fairness to the Fed, its decisions may have resulted from following the
teachings of the mainstream economic theory at the time. It is changes in theory,
however, that have made discretionary policy so unappealing to some economists.
The Fed’s decisions in the 1970s were also made at a time when the economy was
being hit by a series of negative, unexpected shocks. Notably, the Fed was faced with
a slowdown in productivity growth that lasted 20 years and a series of oil shocks that
would have made stabilization policy extremely difficult under any circumstances.
At present, there is very little that can be done to prevent the Fed from making
errors, at least in the short to medium term. Critics believe that if policy were set by
quantitative rules, it would limit errors and actions that are counter-productive in the
long run. As economist William Poole describes it, “you would not want to fly in a
plane whose pilot had been merely instructed to ‘use your best judgment, experiment,
and feel your way along, fly wisely, incorporating all available information.’”4 Yet this
is the essence of discretionary policy. Even if monetary policy has been successful in
the Greenspan era, critics argue that rules would give a predictability and openness
to monetary policy that would enhance corporate and individual decision making, and
thus economic performance.
The “Taylor Rule”
A growing synthesis between the predictive power of Keynesian theory and the
theoretical implications of the rational expectations school of thought led more and
more economists to endorse the work of economist John Taylor, now an5
Undersecretary of the Treasury. Taylor’s work on monetary policy nicely
encapsulates the growing consensus in macroeconomics. Unlike the rational
expectations literature, his work recognizes that economic performance can be
improved in the short run through counter-cyclical monetary policy. Unlike Milton
Friedman’s rule, described below, it recognizes that the relationship between money
growth and aggregate demand is too unstable to base policy upon it. But like both
Friedman and the rational expectations economists, Taylor questions the advantages
– theoretically and empirically – of discretionary monetary policy. The “Taylor rule,”
therefore, attempts to “tie the hands” of policymakers, but in a manner that recognizes

4Robert Solow and John Taylor, Inflation, Unemployment, and Monetary Policy, (MIT Press,
Cambridge: 1998), p. 79.
5See the appendix for a further discussion of the rational expectations critique of

that there is a desirable short-run tradeoff between unemployment and inflation, if
kept within strict limits. The weakness of previous rule-based approaches was that
they seemed incapable of responding to changing economic conditions. By contrast,
Taylor’s rule allows monetary policy to proactively respond to changing economic
conditions without being discretionary.
Taylor suggests that monetary policy can be boiled down to two simple goals.
The business cycle is caused by shocks to the macroeconomy that create two
undesirable effects – deviations in the inflation rate and deviations in the growth rate
of output.6 This is comparable to the old unemployment/inflation tradeoff, but Taylor
focuses on output growth because its relationship with inflation is more direct than7
unemployment. The Fed can manipulate short-term interest rates to minimize the
deviation of both, as it does at present. Thus, Taylor’s rule does not represent a
departure from the current goals of monetary policy. Instead, it represents a
departure in the methods used to reach those goals. Instead of basing interest rate
decisions on the deliberations of FOMC members, the federal funds rate would be
automatically changed on the basis of one equation, so that changes in the economic
growth rate or inflation rate would systematically and predictably lead to changes in
interest rates. For example, he suggests the rule:8
FFR= (R*+I) + a(I-I*) + b(Y-Y*)
FFR = the federal funds rate
R* = the economy’s equilibrium real (inflation-adjusted) interest rate
I = the inflation rate
I* = the desired inflation rate
Y = the economic growth rate
Y* = the economy’s long-run sustainable rate of growth
a,b = parameters chosen by the policymaker
Thus, to formulate a Taylor rule, policymakers must have a reliable (and
constant) estimate for the equilibrium real interest rate (R*) and the long-run
sustainable rate of growth (Y*). They must identify an acceptable rate of inflation
(I*), recognizing the drawbacks of an inflation rate that is too low or too high. And
they must choose parameter values for a and b, based upon how responsive they

6These shocks can take many forms – for instance, shocks to aggregate demand through
changing expectations, or supply shocks to productivity or from resources (e.g., an oil shock).
The theoretical importance of these shocks is that they explain why the economy does not
always grow smoothly and avoid recessions.
7While unemployment is influenced by the business cycle, the “natural rate of unemployment”
is determined by characteristics of the labor market, cannot be influenced by monetary policy,
and may not be constant. In fact, it seems to have fallen in recent years. For more
information, see U.S. Library of Congress, Congressional Research Service, Why Has the
Unemployment Rate Fallen When Inflation Is Stable? by Marc Labonte, CRS report
8John Taylor, “Discretion versus Policy Rules in Practice,” Carnegie-Rochester Conference
Series on Public Policy, 1993, p. 195-214.

desire interest rate changes to be to changes in inflation and output and the relative
harmfulness of higher inflation and lower output. For example, imagine that the
equilibrium real interest rate (R*) equals 2%, policymakers choose a desired inflation
rate of 2%, and the long-run sustainable rate of growth (Y*) is believed to equal 3%.
Policymakers choose to set a and b equal to .5, as Taylor does in his example. In that
case, the federal funds rate would be determined by the equation:
If economic growth fell (rose) one percentage point below (above) the sustainable
rate of growth, then the Fed would decrease (increase) the inflation-adjusted federal9
funds rate by one-half percentage points. If the inflation rate is one percentage point
above (below) the desired inflation rate, the Fed would increase (decrease) the
inflation-adjusted federal funds rate by one-half percentage point.10 For example, if
the economy currently has a growth rate of 4% and an inflation rate of 3%, then the
federal funds rate would be increased by one percentage point (one half percentage
points due to inflation and one half due to growth) to 5% from its long-run trend rate
of 4%.
Research on Taylor-type rules focuses on creating models of the economy that
are meant to be similar to the real economy, and then examining how inflation and
economic growth would have occurred if a Taylor rule were in place.11 According
to its proponents, the volatility of inflation and growth would have been lower under
a Taylor rule than the Fed has achieved historically. To judge which rules produce
the best results, the models make simple assumptions about how much worse off
people become when inflation or economic growth is volatile. This judgement arises
because of the inflation-output tradeoff: the Fed could probably keep inflation
constant at all times, but to do so it would have to let output fluctuate to an
unacceptable degree. Likewise, keeping output constant would cause unacceptably
large fluctuations in the inflation rate. Were the Fed to begin executing monetary
policy on the basis of the Taylor rule, presumably the democratic process would have
a role in determining the relative weighting of these two goals. Taylor’s research
suggests that setting the weights equal (i.e., 0.5) is the best policy to pursue. This
belief is not based on his assumptions of people’s preferences; it is based on research
that suggests to him that if output growth is weighted more heavily, little additional
output stability will be achieved at the cost of much greater inflation variability, and
vice versa.

9Aggregate demand shocks are typified by falling (rising) inflation and falling (rising) growth.
For this type of shock, the Taylor rule instructs interest rates to move together in the same
direction. By contrast supply shocks, like an oil shock, are typified by rising (falling) inflation
and falling (rising) output. For this type of shock, the interest rate dynamics cancel each other
out, leading to a more neutral policy.
10The nominal federal funds rate would rise by one and a half percentage points since the
inflation rate enters the equation twice. Nominal interest rates are equal to real interest rates
plus the inflation rate, which explains why the first term of the rule is (R*+I). Hence, a rise
in inflation would never outstrip the rise in the federal funds rate.
11 See John Taylor, ed., Monetary Policy Rules, (University of Chicago Press: 1999).

Other researchers have added other terms to “Taylor rules.” Some researchers
include the exchange rate in the rule determining the interest rate. This may be more
useful for smaller economies highly dependent on trade than the United States, a large
economy whose output is mostly produced for domestic consumption. Other
researchers have limited how much the interest rate can change in the short run.
These alternative rules are motivated by research that suggests that excessive interest
rate fluctuations have undesirable economic effects. For example, they make business
planning more difficult and can cause financial difficulties through balance sheet
effects.12 Other Taylor rules have been based on forecast values of inflation and
economic growth rather than actual values. This was motivated by the desire to
address the lags that occur in data collection and policy effectiveness. Most Taylor
rules are limited to a few variables, however, because interest rates can only achieve
one goal completely. Each additional goal dilutes the influence that interest rate
changes can have on the other goals.
Different Views on Policy Rules. Monetary policy rules are a standard tool
of macroeconomic modeling today. For some economists, they are merely a handy
instrument to model in a simple, tractable way, but do not make for practical
economic policy in reality. Since high inflation is no longer a threat and the Fed’s
actual behavior in the 1990s has closely mirrored what a Taylor rule would have
mandated, they would argue that the argument for rules is moot.13
Some other economists would see a policy rule as one more research tool to be
added to the Fed’s arsenal. For example, Martin Feldstein believes that
rules should not be viewed as substitutes for judgment by the monetary authorities
but rather as inputs into that judgmental process. A good rule is therefore one that14
provides a useful starting point for central bank deliberations.
In this perspective, the Fed should devise many different models of the economy and
construct policy rules for each model. In reaching its decision about policy changes,
it could then refer to what each rule recommends. To an extent, the Fed already
refers informally to such models to help guide its decisions. This process could
become more formalized and given more importance than it is at present. Donald
Kohn, Director of Monetary Affairs at the Federal Reserve, reports
Federal Open Market Committee (FOMC) members are regularly given some
information on the predictions from monetary policy rules.... But, in truth, only

12One reason that the Fed began targeting the federal funds rate again in the 1980s was
because excessive interest rate volatility had been extremely unpopular with business and
13Economist Benjamin Friedman takes this position in Solow and Taylor, op cit, pp. 55-63.
14John Taylor, ed., Monetary Policy Rules, (University of Chicago Press, Chicago:1999), p.


a few members look at this or similar information regularly, and the number does15
not seem to be growing.
Other economists believe the Fed should switch to a policy rule regime under
normal economic circumstances, with the option to use discretion and ignore rules in
times of crisis or instability. John Taylor explains,
In arguing in favor of policy rules I recognize that certain events may require that
the rule be changed or departed from; that is, some discretion is required in
operating the rule. But there is still a big difference between a policy approach
that places emphasis on rules and one that does not. With a policy rule in mind the
analysis of policy – including questions about whether a deviation from a rule is16
warranted – will tend to focus more on the rule rather than pure discretion.
Some economists would argue that the advantages of a strict policy rule regime
are so great that they outweigh the drawbacks of abandoning all discretion, which
they would claim are mostly illusory anyway. For example, Robert Lucas and
Thomas Sargent argue that
theory predicts that there is no way that the monetary authority can follow a
systematic activist policy and achieve a rate of output that is on average higher
over the business cycle than what would occur if it simply adopted a no-feedback,17
X-percent rule of the kind Friedman and Simons recommended.
Arguments in Favor of Rules
Prevents Short-Term Policymaking
Most economists believe that the U.S. economy suffered from needlessly poor18
monetary policy in the 1970s. Oil shocks and sluggish productivity growth initiated
this period of poor economic performance, but they believe the monetary policy
response exacerbated and prolonged the period of “stagflation.” The standard
economic explanation of why the Fed employed the policy that it did in the 1970s was
that it was attempting to exploit short-term gains at the expense of long-term
economic well-being. The oil shock simultaneously increased inflation and decreased19
economic growth. The Fed responded by using stimulative monetary policy to
revive growth, at the expense of higher inflation. Ultimately, even the short-term

15Taylor 1999, op cit, p. 195.
16Solow and Taylor, op cit, p. 45.
17The authors use the terminology “activist policy” to describe “discretionary policy.” Robert
Lucas and Thomas Sargent, “After Keynesian Economics,” After the Phillips Curve, Federal
Reserve Bank of Boston Conference Series 19, June 1978.
18Nor is the 1970s experience the only recession that economists attribute to the Fed. One
widely accepted explanation of the cause of the Great Depression blames the Fed’s decision
to allow the money supply to drastically shrink in the 1930s.
19See U.S. Library of Congress, Congressional Research Service, Rising Oil Prices: What
Dangers Do They Pose for the Economy?, by Marc Labonte, CRS Report RL30634.

gains it sought became illusory. Since people came to expect rising inflation,
stimulative monetary policy did not “fool” people into producing robust growth – it
was merely passed through to higher prices and the economy suffered the20
distortionary effects of high inflation. Eventually, the Fed was forced to tighten
monetary policy sharply from 1979 to 1982 to reduce inflation to acceptable levels,
resulting in the sharpest recession since the Great Depression. This downturn may
have been much less severe if inflation had not been allowed to creep up throughout
the 1970s.
Why did the Fed make the decisions it did in the 1970s? Clearly, part of the
problem was a lack of consensus by economists at the time that there was no long-run
unemployment-inflation tradeoff. But some economists believe high inflation in the
late 1960s and 1970s was due in part to an unwillingness by the Fed to take tough
stances on the need for interest rate increases. Despite the Fed’s independent status,
some critics argue that the Fed is still run by human beings capable of human
weaknesses who may implement policy that they know is sub-optimal. Absent any
pressure, governors may still implement sub-optimal policies to gain popularity, for
re-nomination or simply for complimentary media coverage.21 While not necessarily
a proponent of rules, former governor of the Fed Alan Blinder believes that the
greatest pressure on the Fed today comes not from other government officials, but
from a desire to please financial markets. The media constantly publicize the opinions
of market analysts regarding the proper monetary policy and the Fed is well-aware
that its decisions often cause large shifts in the prices of stocks and bonds. Blinder
Herein lies an extreme irony. Maintaining a long time horizon is perhaps the
principal raison d’etre for central bank independence. Yet a central banker who
takes his cues from the markets is likely to acquire the markets’ short time horizon.
That is why it is just as important for a central bank to be independent of markets
as it is to be independent of politics.22
A claimed benefit of rule-based monetary policy is the elimination of
opportunities to make policy decisions that have a greater long-term cost than short-
term benefit. By its nature, a simple Taylor rule is incapable of “exploiting” a short-
term tradeoff through “surprise” policy changes – with a rule, interest rate changes
would never be surprising or uncertain. Monetary policy rules could also remove any
psychological influences on the formulation of monetary policy that may make it sub-
optimal. A policy rule is automatic; it would not be influenced by public pressure, the
desire to “please the market,” or political intervention.

20See U.S. Library of Congress, Congressional Research Service, Inflation: Causes, Costs,
and Current Status, by Gail Makinen, CRS report RL30344.
21Because of concerns about popularity, economist Frederic Mishkin believes that there is a
bias towards changing interest rates too infrequently. He believes that this arises because the
Fed is afraid that reversing a previous policy decision would imply to Congress and financial
markets that the Fed had made a mistake; this makes monetary policy less responsive to
economic shocks than it should be. Commentary in John Taylor, ed., 1999, op cit, p. 249.
22 Alan Blinder, “What Central Bankers Could Learn From Academics – And Vice Versa,”
Journal of Economic Perspectives, v. 11, n. 2, Spring 1997, p. 15.

A counter-argument could be raised, however, that policy rule proponents have
not considered. They assume that the rule would be agreed upon and then left
unchanged. But what would prevent the alteration of a policy rule in order to “gun”
the economy before an election? Simply instituting a policy rule is not a guarantee
that monetary policy would become de-politicized.
Reduces Uncertainty / Enhances Decision Making
Rational expectations economic models developed in the 1970s were based on
the principle that rational individuals make optimal decisions based on all of the
information available to them. (See the appendix for a fuller explanation.) This had
two important implications for monetary policy. First, it was no longer believed that
the monetary authorities had superior knowledge in how to move the economy away
from a disequilibrium through discretionary policy changes. Instead, monetary policy
could only have real effects on private activity in these models if the monetary
authority made surprise policy changes. Second, an important reason why individuals
made mistakes was because of uncertainty. Because discretionary policy was not
based on any quantitative, verifiable goal, it increased uncertainty, thus making output
fluctuations more likely. If individuals have already made their best decisions, they
cannot be made better off by policy changes.
The conclusions of rational expectations scholars enhanced the argument for
rules. Previously, proponents of discretion had been able to argue that if
policymakers did not make mistakes in the future, even though they had in the past,
discretion was superior to rules because it was flexible enough to adapt to changing
conditions. Now it was argued that even when discretionary policy adapted correctly,
it still made the economy worse off than a rule-based regime because it increased
uncertainty. 23
As powerful as these theoretical results may be, a look at the empirical evidence
makes it clear that monetary policy, when well-executed, has real effects on the
economy that help reduce fluctuations caused by the business cycle. The Taylor rule
helps bridge the gap between these theoretical results and empirical evidence. It
would allow monetary policy to change in order to reduce economic volatility, but it
would do so predictably and systematically so that individuals would know what
changes they can expect and can arguably incorporate those potential changes into
their decisions. Instead of attempting to stabilize the economy through surprises, it
stabilizes it predictably.
Credibility Enhances the Effectiveness of Monetary Policy
When the Fed undertook disinflation in the early 1980s, much economic research
was devoted to questioning whether the monetary authority’s credibility influenced
the effectiveness of monetary policy. In the short run, inflation is partly determined
by people’s expectations of inflation, through the existence of devices such as

23Stanley Fischer, Rules versus Discretion in Monetary Policy, National Bureau of Economic
Research working paper 2518, 1988.

contracts and menus. If the monetary authority decided to lower inflation, how long
that decrease would take and how greatly it would reduce short-term growth would
be determined in part by how quickly people’s expectations changed. Many
economists posed the question of how the monetary authority’s credibility would
influence those expectations. They concluded that a disinflation executed by a
monetary authority with low credibility would be long and costly because people
would only slowly incorporate lower inflationary expectations.24 For example, when
setting prices or bargaining wages, people would assume that the central bank would
not follow through with its promises to disinflate. Interest rates might even need to
be raised more than would otherwise be necessary to convince people that the central
bank was committed to the policy change and they should alter their expectations.
Alternatively, they concluded that people would change their expectations very
quickly if the central bank was credible. If so, the disinflation would be short and
have a smaller effect on output, and interest rates would need to be raised less.
Policy rules have been suggested as a way to enhance the central bank’s
credibility. Central banks could lose credibility by attempting to surprise markets,
changing policy without clear reasons to do so, or altering policy for political
pressures. A rule, if strictly enforced, would be immune from any of these
possibilities. Under a credible rule, expectations should change rapidly, making
interest rate changes more powerful.
Increased Accountability / Clarification of Policy Goals
Some economists bemoan the lack of objective, numerical goals to guide the
Fed’s actions. In the Greenspan era, the absence of numerical goals may seem
irrelevant, but historically it is striking. While many people undoubtedly considered
the double-digit inflation that monetary policy accommodated in the 1970s to be
unacceptably high, there was certainly nothing in the Federal Reserve Act defining it
to be so. As a result, it is very difficult to objectively measure how successfully
monetary policy has been executed. Rather than aiming for a goal, the Fed issues
subjective, qualitative statements to the public after FOMC meetings which, it is
argued, lack any consistent rationale for its actions. Alan Blinder complains that
Policymaking in the FOMC tends to be far too situational. Consensus is reached
on a meeting-by-meeting basis, based on a painstaking analysis of the current
macroeconomic situation and near-term outlook. But rarely is any attempt made
to reach agreement on the basic conceptual framework for monetary policy –25
including the ultimate targets and the relative weights attached to each.
Hence, no attempt is ever made to define precisely what macroeconomic conditions
people prefer. For example, would people prefer less output growth variability (and

24See Robert Barro and David Gordon, “Rules, Discretion, and Reputation in a Model of
Monetary Policy,” Journal of Monetary Economics 12, 1983, p. 101 and Kenneth Rogoff,
“The Optimal Degree of Commitment to an Intermediate Monetary Target,” Quarterly
Journal of Economics 100, 1985, p.1169.
25Blinder, op cit, p. 5.

more inflation variability) than the Fed pursues at present, or less inflation variability
(and more output growth variability)?
Rules proponents believe this lack of clarity leads to imperfect policy in several
ways. It leaves the markets guessing what the Fed will do next, which lowers
efficiency and well-being by increasing uncertainty. It introduces human error into
what they believe should be a fairly technical, mathematical process. Blinder explains
there are two basic ways to obtain quantitative information about the economy:
you can study econometric evidence or you can ask your uncle.... I believe there
is far too much uncle-asking in government circles in general and central banking26
circles in particular.
Rule proponents further argue that because there is no quantitative goal
underlying its actions, any error – unintentional or planned (e.g., short-term
policymaking, popularity seeking behavior) – would go unchecked. Because there are
fewer democratic checks on the Fed’s power than most policymakers experience,
critics believe that it is important to allow outsiders to hold the Fed accountable for
its actions. Yet some would argue that the current system is structured in such a way
that accountability is deterred. The primary oversight at present comes from semi-
annual hearings before Congress. But because the Fed’s mandate is so broad, vague,
and subjective it can justify almost any action it undertakes as fulfilling its goal to
promote low unemployment, low inflation, or moderate interest rates. Since some
economic data will always contradict other data, the Fed can always point to
something to justify its policy decisions. Hence, it is argued that it is difficult for
Congress to offer specific criticism that could lead to any meaningful policy change.
The President can remove Fed governors “for cause” before their term has ended, but
not on the basis of policy differences or incompetence.27 In practice, the President has
never done so. While government agencies such as the Congressional Budget Office
(CBO), General Accounting Office (GAO), and Joint Committee on Taxation, offer
independent, non-partisan oversight analysis in many fields, the only review of
monetary policy that Congress (officially) receives comes from the Fed itself. GAO
is explicitly forbidden to audit monetary policy. Milton Friedman complains that the
standard objectives of monetary policy, minimizing unemployment and inflation,
are likely to be only very indirectly related to the real objectives of the actual
policymakers...I suspect that by far and away the two most important
variables...are avoiding accountability on the one hand and achieving public
prestige on the other...those two elements...will I believe come far closer to28
rationalizing the behavior of the Federal Reserve over the past 75 years...
Few economists concerned with the issue of accountability would advocate
ending the Fed’s independence – greater accountability would likely come at the cost

26Blinder, op cit, p. 8.
27See Federal Reserve Act, Section 1-078.
28Quoted in Stanley Fischer, “Rules versus Discretion in Monetary Policy,” National Bureau
of Economic Research working paper 2518, 1988.

of poorer long-term policy decisions if elected officials lacked the resolve to raise
interest rates when necessary.29 But proponents believe the adoption of a rule-based
regime could increase accountability and clarify policy goals. Under a Taylor rule, the
goals of monetary policy would be precisely laid out. Presumably, the rule would be
based on a consensus of what goals the public would like to see pursued, since it is
likely that the rule would be approved by Congress. And if a simple Taylor rule were
implemented, subjective decisions, surprise policy shifts, and idiosyncratic goals
become impossible. Policy changes based on hard data can be incorrect, but unlike
changes based on instinct, these errors should cancel each other out on average. On
the other hand, the critique below demonstrates that errors in rules stemming from
data or model uncertainty may take an unacceptably long time to correct themselves.
Can Prevent “Fine Tuning”
A frequent criticism of central banks is that they are overly active in their policy
changes due to a misguided desire to “fine tune” the economy. This criticism was
widely heard during the 1970s when frequent changes in monetary policy did little to
improve economic performance. A popular allegory illustrates why many economists
criticize fine tuning. Many people will hop in the shower in the morning before it has
fully heated up. They respond by turning the hot water up. Soon it becomes scalding,
so they turn it down until it is freezing, and so on. They would experience a far more
enjoyable shower if they had just left it on the original setting, even though it would
have been cold at first. The central bank’s decisions to change interest rates are
equivalent to changing the temperature – they only take effect with a long lag, and a
frequent criticism of the Fed is that policy swings excessively before the effects of
previous rate changes have completely fed through to the economy.
Some economists criticize recent Fed policy as a good example of fine tuning
gone awry. Between September and November 1998, the Fed lowered the federal
funds rate three times. Although the economy was booming at the time, the Fed was
concerned that the Russian debt default and the problems of the hedge fund Long
Term Capital Management would lead to financial instability.30 When financial calm
was restored, the Fed increased interest rates six times between June 1999 and May
2000 to counter the previous cuts that by then had increased aggregate demand to
unsustainable levels. In turn, these six increases were a factor in the economy’s
slowdown from the second half of 2000 until 2001. As a result, the Fed lowered
interest rates six times in the first five months of 2001, by a cumulative total of 2.75
percentage points. Critics pose the counterfactual argument: would the economy
have enjoyed smoother growth in the past two years if interest rates had never been
changed? After all, the federal funds rate in mid-1998 was the same value as the
federal funds rate in January 2001, after the Fed’s second reduction of the year.

29For an overview and empirical evidence, respectively, see U.S. Library of Congress,
Congressional Research Service, The Economics of Federal Reserve Independence, by
Thomas Woodward, CRS Report 90-118E; and Central Bank Independence and Economic
Performance: What Does the Evidence Show?, by Gail Makinen, CRS Report 97-767E.
30See U.S. Library of Congress, Congressional Research Service, Financial Risk: An
Overview of Market and Policy Decisions, by Mark Jickling, CRS report RL31045.

Some economists question whether the fine tuning critique is rigorous enough
to translate into a useful policy prescription. As Alan Blinder quips,
I fail to see any bright line – and maybe not even a dim one – between coarse
tuning, which is what central bankers are supposed to do, and fine tuning, which
is what they are supposed to avoid... (P)olicymakers must make some decision at31
each moment in time. Even doing nothing – whatever that means – is a decision.
In the case of the 1998 financial unrest, weren’t lower interest rates the appropriate
response, even if it did constitute “fine tuning”? Would keeping interest rates
constant truly have been a more appropriate, or even a more neutral, policy?
The exact definition of fine tuning is imprecise. If it is meant to imply that
changes in interest rates should be infrequent, then this could easily be written into a
policy rule. For instance, since changes in output occur more quickly than changes
in inflation, interest rate changes could be made relatively infrequent by placing
greater weight on the inflation variable than the output variable in the Taylor rule.
Interest rate changes could also be made infrequent by adding an additional term to
the Taylor rule that would make any new change partly dependent on the previous
interest rate. In this case, the Taylor rule would read:
FFRt= (R*+I) + a(I-I*) +b(Y-Y*)+cFFRt-1
FFR t= the new federal funds rate
FFRt-1 = the previous federal funds rate
R* = the economy’s equilibrium interest rate
I = the inflation rate
I* = the desired inflation rate
Y = the economic growth rate
Y* = the economy’s long-run sustainable rate of growth.
a, b, c = parameters of the policymaker’s choice
With a Taylor rule of this form and a relatively large (positive) value for the parameter
c, large and/or frequent changes in the federal funds rate would be limited, assuming
changes would continue to be rounded to 1/4 percentage point intervals. Even if
changes in output and inflation suggested the rate should change, this would be
counterbalanced to the extent that parameter c designates, which would keep the rate
constant. Alternatively, if policymakers were not concerned with preventing fine
tuning, they could adopt a Taylor rule that excluded the term FFRt-1.
Non-Economic Considerations
This report considers the rules-discretion debate on the basis of economic
efficiency. But some observers believe there are important issues relating to
democracy and power that stem from the current institutional framework. Namely,

31Blinder, op cit, p. 12.

they object to the concentration of discretionary power over financial and economic
conditions in the hands of government officials who are not directly democratically
accountable. Many of these observers favor institutional changes that would limit or
eliminate this concentration of power such as the abolition of the Federal Reserve and
its monopoly control of the money supply or a return to the gold standard. Economic
theory suggests that these options would have serious economic costs. By removing
the discretionary power of the Fed, the adoption of a Taylor rule regime might fulfill
their aims with a far lower loss of economic efficiency.
Criticisms of Policy Rules
Unsurprisingly, a policy prescription that sounds good to economists in theory
has come under fire as being impractical – and, in some ways, counterproductive –
in the real world. The following section reviews major criticisms.
Does Alan Greenspan Obviate the Need for a Policy Rule?
Certainly, much of the support for policy rules grew out of the stagflation of the
1970s. To many economists of the time, the Fed’s problems seemed incurable. To
them, any drawbacks of giving up discretionary control were clearly outweighed by
the palpable drawbacks of keeping discretion. But today’s economy is much different
from the 1970s. Inflation has been below 4% since 1992 and the current economic
expansion has now become the longest in U.S. history. To many, credit for this turn
of events lies in no small part to the work of the Fed under Chairman Alan Greenspan.
In these circumstances, it is useful to revisit the question of whether the drawbacks
of discretionary policy outweigh the drawbacks of policy rules. As proof that the
drawbacks have become negligible in the 1990s, proponents of discretion can point
to the fact that work by John Taylor himself suggests that the Fed’s decisions in the
1990s closely parallel the decisions suggested by the Taylor rule.32 As economist
Benjamin Friedman quips,
“Most of the economists who have advocated monetary policy rules in the
past...would be startled to think that the main import of that entire line of research
had been merely to provide new words to describe what our central bank, in its33
wisdom, has been doing all these years anyway.”
This is a far cry from the past. Taylor’s research suggests that in the 1960s and 1970s
monetary policy under a rule would have greatly differed from the historical
The Fed’s recent performance is a powerful argument to many observers that
problems with credibility under discretion have become insignificant. As discussed
above, one major purported benefit of a rule is that it would enhance the Fed’s
credibility, making changes in policy quicker and less costly since people’s

32Taylor 1999, op cit, p. 338.
33Solow and Taylor, op cit, p. 63.

expectations would change more quickly. Yet it is hard to imagine that the Fed could
gain more credibility with the public than it has in the Greenspan era.34
Economist Frederic Mishkin has made three rebuttals to this argument. First, at
some point the septuagenarian Chairman must retire. There is no guarantee that his
successor will be as capable as he has been. Second, the Clinton Administration was
highly supportive of the Fed’s independence even when interest rates were increasing.
There is no guarantee that some future Administration will not attempt to pressure the
Fed into making inferior trade-offs for short-term advantage. Third, it can be
questioned whether the good economic fortune of the 1990s was not attributable to
just that – the good fortune of not having experienced any large, negative economic
shocks throughout that decade. There is no way of testing the counterfactual
argument that if the economy had experienced a large economic shock, discretionary
policy would have outperformed a policy rule (since it arguably did not in the 1970s)
and the Fed would still have been able to withstand political pressure (which would
presumably have been greater under adverse conditions) to exploit short-term policy
gains.35 In fact, the Fed faced positive supply shocks in the late 1990s such as
unexpectedly high productivity growth and low energy prices that probably subdued
inflationary pressures.
Could the Fed Quell a Financial Panic Under a Policy Rule?
In normal circumstances, aiming to stabilize inflation and output may be
sufficient tasks for the central bank to sustain a sound economy, and may be tasks that
a policy rule is capable of achieving. But in times of financial panic, opponents would
argue that a policy rule would be inadequate.
The financial sector plays a unique role in an economy, and panic in that sector
can easily spill over into much greater macroeconomic problems. It is not
coincidental that the country’s most serious bank panic of the 20th century took place
during the Great Depression. This experience reinforced the belief that an important
role of the central bank is to act as a lender of last resort. Oftentimes, a major
component of financial panic is a lack of liquidity – there is nothing fundamentally
unsound about borrowers or financial intermediaries, they are simply unable to
convert their assets into the cash that they need to meet their current obligations.
Many economists believe that only the central bank, with its ability to create
money at will, can offer the financial system enough liquidity to quell panic.
Increasing liquidity refers to an easing of monetary policy through open market
operations in response to financial rather than macroeconomic (e.g., inflation and
output growth) developments. Examples include events following the stock market
crash of 1987 and the Russian debt default of 1998. In both cases, the Fed
aggressively lowered the federal funds rate in response to financial market unrest
although economic growth was strong. As the increased liquidity replenished the
reserves of financial institutions, concern subsided. If interest rates were lowered to

34For example, see “Almighty Alan Greenspan,” The Economist, January 6, 2000.
35Taylor 1999, op cit, p. 330.

increase liquidity during financial panic, a simple policy rule would be violated since
macroeconomic conditions governing the rule would not have changed, or at least
would not yet have been measured to change (see the section entitled “Problems with36
Data Collection”).
The effectiveness of the Fed’s lender of last resort function would also be
hampered by a policy rule. This function refers to direct lending through the discount
window by the Fed to a particular troubled institution or institutions. It is undertaken
because oftentimes problems at one large institution can spread to a more generalized
financial panic if left unchecked. Under a Taylor rule, discount window lending could
still be used to help specific troubled institutions. But discount window lending could
not be used to increase overall liquidity in the financial system. The Fed lends through
the discount window to restore banks’ depleted reserves, and the federal funds rate
is the market rate at which bank reserves are lent. As discount window lending makes
reserves more plentiful, all else equal, their price – the federal funds rate – would fall,
violating the policy rule. Thus, to adhere to a Taylor rule, the increase in liquidity
caused by discount window lending would need to be neutralized through
contractionary open market operations, making it a zero-sum game. This would make
the Fed’s lender of last resort powers far more modest than at present. In a serious
financial panic, it may be of limited use since it would amount to “robbing Peter to
pay Paul” – increasing a troubled bank’s liquidity could only be accomplished by
reducing the liquidity of other banks.
It seems impossible to write a quantitative policy rule that would increase
liquidity during a financial panic. Bennett McCallum suggests that the rule should
only be adhered to as a quarterly average, allowing the federal funds rate to be
lowered for short periods of time during liquidity crises.37 Other rule proponents,
including John Taylor, have suggested suspending the rule during financial crises. But
opponents of rules have forcefully argued that many of the advantages offered for
having a policy rule are invalid if the rule can be abrogated. “Panic” is a subjective
concept and, therefore, lowers accountability and may be open to manipulation by
policymakers with a desire to exploit short-term trade-offs. The ability to abrogate
rules may negate the additional credibility that rules are meant to offer. Most
importantly, the argument that policy surprises should never be allowed because
individuals have already incorporated all economic uncertainty in their decisions
would be clearly violated if rules could be abrogated. Under this reasoning,
individuals could only be worse off when rules are abrogated, even in crisis, because
it would increase their uncertainty.

36Keeping the interest rate constant during a liquidity crisis, as a simple Taylor rule would do,
implies some loosening of policy since the rising demand for reserves would otherwise push
up rates. But many rule proponents who have acknowledged this problem have admitted that
this may not be enough to quell panic.
37Bennett McCallum, “Monetary Policy Rules and Financial Stability,” National Bureau of
Economic Research working paper 4692, 1994.

Problems with Lags
Under a Taylor rule, interest rates would be changed when data become available
that indicate that output or inflation has changed from its desired path. Unlike
discretionary policy, a Taylor rule cannot be preemptive and change interest rates
before output and inflation have actually changed. However, preemptive changes are
often necessary since changes in interest rates do not affect inflation and output
immediately. Most estimates indicate that interest rate changes take anywhere
between six months and two years to become fully effective. This implies that the
Taylor rule could cause long periods of inferior economic performance before the
economy was brought back to equilibrium. Thus, critics argue that the Fed’s ability
to account for these lags and stay one step ahead of the game gives discretion an
important advantage over rules.38 It is important to note that lags are one of the main
reasons why discretionary policy decisions are sometimes incorrect, yet rules –
advocated by some as a way to avoid discretionary errors – may do nothing to
improve on those types of mistakes.
Taylor rule proponents have at least three replies to this argument. First, some
variants of the Taylor rule address this criticism directly by making the federal funds
rate dependent on forecasts (1-2 years in the future) of output and inflation, rather
than on their current values.39 Thus, these types of rules are as forward looking as
discretionary policy can be. Other proponents argue that their simulations
demonstrate that despite the lags in effectiveness that they build into their models,
using current data delivers economic performance comparable to rules that use
forecasts. Thus, they see the lag argument as a straw man. Such conclusions,
however, are highly dependent upon their modeling of the economy. Specifically, the
results are dependent on the assumption that individuals have forward looking
expectations of the future that cause long-term interest rates to change at the same
time as monetary policy changes short-term interest rates. Finally, although correct
intuition about the future direction of the economy may allow discretionary policy to
outperform a Taylor rule, intuition is as likely to be incorrect, in which case discretion
would not deliver better results.
Problems with Data Collection
Lags in data collection would exacerbate the lags in monetary policy that would
be problematic under a Taylor rule. For instance, GDP data are only available on a

38These lags in policy effectiveness may also make a simple Taylor rule overshoot the desired
interest rate when the economy is coming out of a recession. Imagine that the economy enters
a recession and the federal funds rate must be lowered one percentage point for economic
recovery. Once this one percentage point decrease is (eventually) fed into the Taylor rule, it
would take time, say a year, for the change to have its full effect on the economy. Since one
year later, the changes would not have yet fully affected the economy, the Taylor rule would
lower the federal funds rate further, to a point that might overstimulate the economy once the
later rate reduction fully took effect.
39Since forecasting is far from a science, using forecasts in a Taylor rule could potentially
have the unintended consequence of shifting discretion from policymaking into forecast
making, unless the Fed were required to use outside forecasts.

quarterly basis at present, and are released nearly a month after the quarter ends. If
growth slows significantly in a quarter, as it did in the fourth quarter of 2000,
monetary policy rules could not react to this slowdown until 2001. Again, using
forecasts in a Taylor rule rather than actual data would be one way to avoid lags in
data collection. And with enough additional resources, data could be collected and
released more quickly.
Measurement problems with data also cast doubt upon the efficacy of a simple
rule. For example, measurement problems with the consumer price index (CPI) are
well documented.40 It is most accurate to view the CPI as giving a snapshot of
inflationary pressures in the country, but an imprecise snapshot. Under discretionary
policy, the Fed can use its expertise and compare other data sources to judge whether
the CPI is giving an accurate portrait of inflationary pressures at any given time.
Under a Taylor rule, no such judgement can be made – the CPI, whether it is right or
wrong, would be fed directly into the interest rate decision.
Another practical problem with a Taylor rule policy regime is the substantial
revisions that data routinely undergo. For example, in 1990 when GDP data were
first released they showed an economy that was still growing, albeit slowly. Once the
data were revised months later, they revealed that the economy had actually suffered
a three quarter recession from 1990-1991. Had the Taylor rule been in place at the
time, the preliminary data might have kept interest rates constant when a rate cut
would have been more appropriate.
Taylor rule proponents would argue that these drawbacks are equally important
under a discretionary regime. Again, they would argue that simply because the Fed
can follow its “gut instinct” under discretionary policy does not imply that its “gut
instinct” will be correct. In fact, in the case of the 1990 recession the Fed arguably
reacted too slowly to deteriorating economic conditions. With the aid of hindsight,
we know that the contraction began in the third quarter of 1990, yet interest rates
were not aggressively lowered until the beginning of 1991. In part, this was because
the Fed was reliant on that same incorrect preliminary data as would a rule based
policy regime. Again, neither rules nor discretion have an obvious advantage in
avoiding the difficulties endemic to monetary policy.
Model Uncertainty
Perhaps where the argument for a Taylor rule is weakest is in the evidence that
its proponents provide to prove that a Taylor rule would work better than
discretionary policy. Since no country has ever formally adopted a policy similar to
a Taylor rule, there is no empirical evidence to compare the two policy regimes.41

40See U.S. Library of Congress, Congressional Research Service, The Consumer Price Index:
Recent Improvements and Prospective Changes, by Brian Cashell, CRS report RL30019.
41Some countries have adopted inflation targets. Many of these countries have experienced
lower and less volatile inflation since the adoption of inflation targets. This favorable
experience may be colored more by other developments. For example, some of these countries

Instead, Taylor rule proponents use simulation results which, they claim, demonstrate
that if a Taylor rule had been in place historically, economic performance would have
been superior to actual experience.
Critics claim that these simulation results prove nothing. There is no way to tell
how a very complex economy would have actually responded to a hypothetical
situation. A model is a very simple approximation of the economy, and the results
that models generate are highly reliant on the assumptions that are made within the
model. There is no consensus in the macroeconomic literature about what
assumptions should be made in these models, so the structure of the models vary
widely. Economist Bennett McCallum cites money demand, consumption behavior,
investment demand, and exchange rate effects as important aspects of a
macroeconomic model where there is a lack of understanding and consensus among
economists.42 As a result, Taylor rules that do well in one particular model may prove
unstable in another model, even though the models are estimated and simulated with
the same actual data from the U.S. economy. At an NBER conference, a Taylor rule
with the same parameters was fed into different models based on the same U.S. data,
and the simulated performance of the economy varied widely from model to model.
In some models, the Taylor rule caused the variability of inflation and output to reach43
infinity. Critics conclude that if a rule cannot perform well from model to model,
it has little chance of performing well in the actual economy.44
McCallum, a policy rule proponent, addresses this model uncertainty problem
by stressing the importance of devising Taylor rules that generate positive results
across a variety of different models, rather than looking for the best rule in any
particular model. His research suggests that simple Taylor rules, in which interest
rates respond to only a few variables, seem to meet this criterion more consistently
than complex rules. Rules that respond to changing economic conditions with
cautious policy changes rather than aggressive responses also seem to do better across
many different models.45 McCallum also stresses the need for a Taylor rule that

simultaneously increased the independence of their central banks, a consensus emerged among
central bankers in the 1990s that low and stable inflation was desirable, and the 1990s were
relatively free of the types of negative external shocks that lead to poor macroeconomic
performance. Furthermore, if inflation targeting did prove superior empirically, this does not
prove the case for the Taylor rule since, as noted below, targets still allow the central bank to
act with discretion.
42Bennett McCallum, “Issues in the Design of Monetary Policy Rules,” National Bureau of
Economic Reserach working paper 6016, 1997.
43Taylor, 1999, op cit, pp. 1-14.
44Some of these models are also open to the Lucas Critique – they assume that individuals
would act the same way under a Taylor rule as they did historically under discretionary policy.
Yet the fact that the Taylor rule is supposed to improve decision making behavior suggests
that these simulation results may be invalid.
45Taylor, ed., 1999, op cit., p. 15.

depends on prompt and reliable data – unlike the GDP data that come out quarterly
and are often subject to considerable revision.46
How Fast Can the Economy Grow?
To operate a Taylor rule, certain assumptions must be made about equilibrium
economic conditions since policy changes must be made relative to some benchmark.
Donald Kohn of the Fed believes that
“(Fed) Members seem to regard the use of rules to guide policy as questionable in
part because they are uncertain about the quantitative specifications of the most
basic inputs required by most rules and model exercises. They have little
confidence in estimates of the size of the output gap, the level of the natural or
equilibrium real interest rate, or even the level of the actual interest rate, since47
inflation expectations are at best only imperfectly observable.”
It is difficult enough to estimate equilibrium values for these variables, but what
makes this effort particularly problematic is that these values may unexpectedly
change. To understand why this is problematic, one can take the example of
economic growth. Virtually all Taylor rules are concerned with minimizing the
variability of output. But to minimize the variability of output, it must be relative to
a standard, which is the sustainable rate of economic growth. Unfortunately, the
sustainable rate of growth is unknown and seems to have increased in the late 1990s
thanks to a surge in productivity growth.48 A likely alternative would be the
unemployment rate, but the natural rate of unemployment has been equally unstable49
(downward) in recent years.
Much of the credit that Alan Greenspan has received from many analysts is due
to the fact that he recognized that the sustainable growth rate seemed to be rising in
the late 1990s, and did not raise interest rates when actual growth increased above a
level previously believed to be unsustainable. The Taylor rule may have suggested the
opposite policy. Using the first Taylor rule presented, if one had assumed that the
sustainable rate of growth was 2.5%, as it seems to have been from about the mid-
1970s to the mid-1990s, then when growth increased to 3.5% in 1996, the federal
funds rate would have been raised by one-half percentage points although inflation
was not increasing. Had growth continued to exceed 2.5% in the following years, the
federal funds rate would have continued to be raised. Eventually, the sustainable
growth rate used in the Taylor rule could have been changed, but this would probably

46Bennet McCallum, “Issues in the Design of Monetary Policy Rules,” National Bureau of
Economic Research working paper 6016, 1997
47Taylor, 1999, op cit, p. 195.
48For more information, see U.S. Library of Congress, Congressional Research Service, The
New Economic Paradigm: Is It New and Is It a Paradigm? by Marc Labonte and Gail
Makinen, CRS Report 98-90E.
49For more information, see U.S. Library of Congress, Congressional Research Service, Why
Has the Unemployment Rate Fallen When Inflation Is Stable?, by Marc Labonte, CRS
Report RL30738.

have been done very cautiously, as modifications to the rule would always be viewed
with a suspicion of ulterior motives.
Taylor rule proponents can rebut this argument in three ways. First, in the long
run monetary policy has no real effect on GDP. Thus, incorporating an incorrect
sustainable growth rate in a Taylor rule can have no permanent effect on growth.
Second, in the medium run a policy of incorrectly high interest rates, brought about
by an mistakenly low sustainable growth estimate, would slow the inflation rate below
its target in the Taylor rule. This would cause the federal funds rate to be lowered.
But as always, John Maynard Keynes’ timeless saying is applicable to these two
arguments: “in the long run we are all dead.” Third, as can always be argued against
discretionary policy, in this case the Greenspan Fed made the correct subjective
judgment that the sustainable growth rate had increased. But it could have just as
easily made an incorrect judgment. Had its judgment been wrong, the economy
would have performed poorly.
Comparing the Taylor Rule to Other Policy Regimes
The Taylor rule has not been the only alternative offered to discretionary policy.
Most alternatives are motivated by similar arguments to those used by Taylor rule
proponents. This section compares these alternatives on the basis of the purported
benefits and drawbacks to the Taylor rule discussed above.
Inflation Targeting. Inflation targeting can be thought of as a rule that is in
some ways stricter than the Taylor rule, but in practice more lax. Economist Lars
Svensson distinguishes between instrument rules, like the Taylor rule, and target rules,
like inflation targeting.50 Instrument rules instruct the central bank how to
mechanically implement monetary policy. Under the Taylor rule, the central bank is
precisely instructed when and by how much interest rates should change based on
changes in economic data. By contrast, targeting rules give the central bank a goal,
but allow it discretion in choosing how to accomplish that goal. Under inflation
targeting, which many central banks have adopted,51 the central bank is instructed to
change interest rates as it sees fit such that a predetermined inflation rate is maintained
(or inflation is kept within a predetermined band.)
In theory, inflation targeting could be stricter than a Taylor rule. If central banks
were mandated to literally maintain a particular inflation rate without any deviation,
then central banks could not react to changes in output at all, and output volatility
would probably be much greater than desired – especially when the economy was hit

50Lars Svensson, “Inflation Targeting as a Monetary Policy Rule,” National Bureau of
Economic Research working paper6790, 1998.
51These banks include the Bank of England, the European Central Bank, and the Reserve Bank
of New Zealand. For more information, see U.S. Library of Congress, Congressional
Research Service, “Price Stability” as the Sole Goal of Monetary Policy: The Experience
of Five Countries, by Gail Makinen, CRS Report 98-719E; Would Committing the Federal
Reserve to a Goal of Price Stability Promote Economic Efficiency?, by William Bomberger
and Gail Makinen, CRS Report RL30102.

by supply shocks. Under a fairly standard assumption that output responds to
changes in interest rates faster than inflation, it seems likely that short, sharp
downturns would be necessary to wring inflation out of the system if inflation were52
to be able to hit its target quickly.
In practice, no central bank seems to target inflation so strictly. Instead, they
aim to keep the inflation forecast for a year or two in advance within the target range,53
and do not react strictly when actual inflation misses its forecast. By operating in
this way, central banks can diminish output volatility in practice. To an extent,
responding to changes in output reinforces their goal of keeping the inflation forecast
stable because present changes in output have some influence on future inflation.
In practice, central banks with inflation targets seem to enjoy modestly less
discretion than the Fed since they need to demonstrate that they are working towards
a precise goal. But they clearly enjoy much more discretion than a Taylor rule regime
envisions. There is still the potential for the central bank to change policy in
subjective, idiosyncratic ways, at least temporarily. And to date, no central bank has
been admonished for missing its target. Economists Ben Bernanke and Frederic
Mishkin explain that
“interpreting inflation targeting as a type of monetary policy rule is a fundamental
mischaracterization of this approach as it is actually practiced by contemporary
central banks.... It is most fruitful to think of inflation targeting not as a rule, but
as a framework for monetary policy within which ‘constrained discretion’ can be
Thus, in practice inflation targeting can be thought to both enjoy the purported
benefits of a Taylor rule and suffer the purported drawbacks of a Taylor rule, but to
a much lesser extent than the Taylor rule does on both counts. It should probably be
compared to the Taylor rule on these grounds, not on the grounds it was originally
envisioned. Inflation targeting in practice may have its merits, but it does not appear
to offer the constraints that its original proponents envisioned.
Nominal GDP Targeting. Since an inflation target, if strictly applied, cannot
respond sufficiently to output shocks, some economists have suggested a somewhat

52For example, imagine that inflation responds to interest rate changes in one year and output
responds to changes in six months. If inflation was above its target, interest rates would have
to sharply rise. In six months, this might lead to a recession, yet under a strict target, since
inflation had not yet fully responded to the previous change, interest rates could not be
lowered and might even be raised further.
53It can be questioned if a strict inflation target technically could be maintained without error
over a short time horizon since monetary policy affects inflation with a lag. The same is true
for a nominal GDP target.
54Ben Bernanke and Frederic Mishkin, “Inflation Targeting: A New Framework for Monetary
Policy?” Journal of Economic Perspectives, v.11, n.2, Spring 1997, p. 106.

different policy rule that targets nominal GDP.55 While this is a target rule rather than
an instrument rule, the goals of the target are the same as the Taylor rule – to allow
monetary policy to react to both changes in inflation and changes in output. Since
nominal GDP is merely the sum of real GDP and the inflation rate, under a nominal
GDP target one can only increase if the other decreases.
The difference between the two, therefore, comes primarily in the
implementation of policy. The Taylor rule tells policymakers how to react to policy
developments whereas the nominal GDP target tells policymakers to use their
discretion to hit their target. But it is unclear how to enforce accountability under a
nominal GDP target. Because large errors are typical in forecasting and the economy
is often hit with unpredictable shocks, it may be technically infeasible to expect a
central bank to hit a nominal GDP target. If a GDP target were missed because of an
unexpected shock, it does not seem clear that the central bank should be reprimanded.
But if a nominal GDP target cannot be reached, then how can the central bank’s
performance be objectively evaluated? When policy errors led to a missed target,
what would prevent the central bank from claiming that shocks were to blame?
The Gold Standard. The earliest constraint on central bank discretion was
a monetary arrangement that pre-dated the existence of central banks in many
countries. This was the gold standard, the monetary policy regime of the United
States and much of Western Europe during parts of the nineteenth and early twentieth
centuries. A key tenet of early supporters of the gold standard was that money was
only “sound” if it was backed by gold at a fixed rate. The monetary authority could
only be prevented from “debasing” the currency through inflationary finance if citizens
reserved the right to exchange their paper currency for gold at a predetermined rate.
A gold standard is implemented and maintained by the government specifying a
price of gold and then buying or selling whatever amount of gold is necessary to keep
its price constant. Once the price is set, the non-monetary use of gold and the cost
of mining will determine the U.S. money supply. Thus, a goal such as price stability
is no longer attainable, as the government would no longer be able to change the
money supply or the federal funds rate to meet changing financial conditions. Thus,
in proponents’ eyes, it would no longer be possible for the monetary authority to
abuse its power. Under a gold standard, the goal of monetary policy is clear and
immediate, and there is no opportunity for the monetary authority to stray from that
goal to promote other goals. By changing the means by which monetary policy is
executed, its goals have necessarily been changed as well. Under a gold standard, the
stability of inflation and output growth, for example, could no longer be goals;

55For example, see Robert Hall and Gregory Mankiw, “Nominal Income Targeting,” in
Mankiw, ed., Monetary Policy, National Bureau of Economic Research, 1994, p. 71.

maintaining a constant price of gold would be the only function of monetary policy.56
The problem that most economists see with keeping the price of gold constant
is the fact that the relative value of gold, like any other commodity, is not constant
over time. It fluctuates as non-monetary demand (e.g., how many people desire to
buy jewelry) and the supply of gold (largely determined by the cost of mining) change.
Gold standard proponents often dismiss this problem, but theory suggests that it is
very serious: the inflation rate for the entire country is decided by factors that have
little to do with the health of the economy. Specifically, for the gold standard to
provide a low and stable inflation rate, the supply of gold would need to grow at the
rate consistent with the rate at which the economy and the demand for gold are
In fact, neither of these things has happened, and the nominal price of gold has
fallen consistently in the past 13 years. As measured by the producer price index, the
price of gold is now 35% lower than it was in 1987. Whether or not the dollar price
of gold is kept constant by a gold standard, the value of gold compared to
hamburgers, cars, haircuts, and all other goods and services has fallen over this time
period. To maintain a gold standard during this time, the United States would have
needed to experience deflation, a falling general price level, of 35% from 1987 to
2000. Deflation would be necessary because only a shrinking money supply could
keep the price of gold constant when the value of gold falls. If the amount of money
in circulation is falling, the price of all goods and services must fall. Because prices
are not completely flexible, they cannot fall immediately, and deflation would have
likely caused higher unemployment and lower growth. This happened in practice
several times when the United States operated a gold standard during the 19th
century.57 From 1873-1933, the United States experienced 17 years of deflation,58
several years of zero inflation, and 17 recessions.
By preventing the government from implementing a discretionary monetary
policy, a gold standard also arguably would remove the Fed’s ability to act as a lender59
of last resort and add liquidity to the financial system during times of crisis. Some

56Historically, a gold standard has been used to pursue a goal of fixed international exchange
rates. Exchange rate stability is a benefit that would partially offset the likely cost of greater
inflation and output variability that a gold standard would cause. This goal can only be
accomplished if one’s trading partners are also using a gold standard. If the United States
adopted a gold standard unilaterally, and our trading partners did not, such an action would
not achieve fixed exchange rates. Many gold standard proponents believe that the economic
might of the U.S. would lead other countries to willingly join a gold standard if this nation did,
thus producing fixed exchange rates.
57A quasi-gold standard was in operation in the United States from 1934-1973. Because it
was not a true gold standard, the monetary policy used during this period did not constrain the
use of discretionary monetary policy in practice. For more information, see CRS Report 96-

986E, Brief History of the Gold Standard in the United States, by Thomas Woodward.

58National Bureau of Economic Research and Consumer Price Index.
59The Fed might still be able to act as lender of last resort by lending troubled banks its excess

economists believe that the maintenance of the gold standard until 1933 was one of
the key reasons that the money supply shrank so dramatically from 1929-1933, and
why the Fed was unable to end the banking crisis during the Great Depression. All
of these factors suggest that if one’s goal is to remove the Fed’s discretionary powers,
a Taylor rule can achieve those goals with a much lower loss of economic welfare
than the re-adoption of a gold standard.

gold reserves under a system where currency was not 100% backed by gold. However, it
could not provide banks unlimited liquidity, as it can do in the current system.

Appendix: The History of Monetary Policy Rules
While the Taylor rule may be the most popular rule in academic circles at
present, it is by no means the first. The gold standard can be thought of as the first
policy rule regime, and when it collapsed (for the final time), economists wary of
discretionary policy began formulating alternatives. This section will give a historical
review of the literature to explain why economists have proposed policy rules, how
these propositions have changed over time, and the economic circumstances that have
motivated those views.
Friedman’s Money Supply Rule
One of the first prominent proponents of a rule based policy for the Federal
Reserve is Nobel Laureate Milton Friedman. An important part of Friedman’s
intellectual effort has been spent on the monetary history of the United States and it
has convinced him that the Federal Reserve has been responsible for many of the
demand shocks that have generated the business cycle in U.S. history. He has been
especially critical of Fed performance during the “great contraction” in the money
stock that occurred during 1929-1933. Without this contraction, which the Fed did
little to prevent and may have set in motion, he has argued, the Great Depression
would have been a mild downturn. In his opinion, this is only the most egregious
instance of perverse Fed policy.
In order to minimize demand shocks of a monetary nature from occurring, Prof.
Friedman proposed replacing the monetary policy decision making center at the
Federal Reserve by a rule that fixed the growth rate of the money supply. The
quantitative parameters of the rule depended on the measure of the money supply
involved. Prof. Friedman observed that the turnover rate of the M1 measure of
money grew, on average, about 3% per year over the period 1960-1980. Since
economic output also grew on average about 3% per year, price stability could be
achieved if the M1 measure of money were held constant. Friedman also observed
that the turnover rate of the M2 measure of money was virtually constant over the
period 1960-1990. This being the case, for money spending (using M2 as the measure
of money) to grow 3% per year would require M2 to grow by that percentage. His60
growth rate rule for M2 embodied this finding.
For the Friedman rule to operate, two conditions had to prevail. First, the
turnover rate of money needed to be stable and predictable. If the turnover rate were
not stable but varied in an unpredictable fashion, then the growth rate rule would not
eliminate monetary shocks and, arguably, could be more destabilizing than the
discretion that Friedman dreaded. Second, the international exchange rate regime
prevailing at the time that used fixed or pegged exchange rates would have to be

60M1 and M2 are different definitions of money measured by the Federal Reserve. M1
includes currency, traveler’s checks, demand deposits, and other checkable accounts. M2
includes the same categories of assets as M1 as well as time and savings deposits under
$100,000, individual holdings in money market mutual funds, and money market deposit

scrapped. Friedman’s rule would only operate in a world of flexible exchange rates
since the money growth rate rule might conflict with the need to keep the exchange
rate peg unchanged. It should also be noted that Friedman’s rule would prevent the
Federal Reserve from performing its role as a lender-of-last resort. So long as it
adhered to the rule, it could not respond to financial crises.
Friedman claimed his proposal for a rule-based monetary policy to be not merely
economically superior to discretion, but more consistent with the goals of liberty and
democracy as well. He could not accept the undemocratic concentration of power in
the hands of a few unelected individuals that an independent Federal Reserve
The problem is to establish institutional arrangements that will enable government
to exercise responsibility for money, yet will at the same time limit the power from61
being used in ways that will tend to weaken rather than strengthen a free society.
In Friedman’s eyes, the contrast between rules and discretion in monetary policy was
analogous to the contrast between the Bill of Rights and leaving decisions of liberty
in the hands of the legislature. He reasoned satirically,
Why not take up each (free speech) case separately and treat it on its own merits?
Is this not the counterpart to the ususal argument in monetary policy that it is
undesirable to tie the hands of the monetary authority in advance; that it should be
left free to treat each case on its merits as it comes up? Why is not the argument62
equally valid for speech?
The fate that befell the Friedman rule may prove illustrative of the fate that
awaits other rule-based regimes. The stability and predictability of the turnover rate
of both M1 and M2 vanished. Both became unstable and unpredictable over the last
20 years of the 20th century. Once this happened, the blind adherence to such a rule
would, ultimately, have been the cause of substantial economic instability. Friedman
believed that it was not necessarily money demand that was unstable, but rather the
way it was measured. He, and many other economists, devoted later research efforts
to finding some measurement of money that would prove more stable than M1 or M2,
and could therefore be used in a monetary policy rule. The search continues,
however, for a stable and predictable measure of money. Other researchers, including
John Taylor, would instead attempt to develop alternative policy rules that were not
reliant on a stable relationship between the money supply and aggregate demand.
The Rational Expectations Revolution
Until the 1970s, economists Robert Lucas and Thomas Sargent complained that
macroeconomic theory was based on ad-hoc, rule-of-thumb, invariant assumptions

61Milton Friedman, “An Independent Monetary Authority,” in Leland Yeager, ed., In Search
of A Monetary Constitution, Harvard University Press, (Cambridge: 1962), p. 220.
62Ibid, p. 240.

about human behavior at the aggregate level.63 This branch of the discipline was
somewhat divorced from microeconomic theory, which built behavioral response
models based upon rational, well-informed, welfare-maximizing economic agents.
What these macroeconomic models seemed to lack in theory was compensated by
their empirical predictive power at the time. Important, observable economic
phenomena such as recessions, slow price adjustment, and the stabilizing effect of
monetary and fiscal policy could all be well accounted for in econometric studies
based on these Keynesian models.
“Rational expectations” economists such as Lucas and Sargent arguably led a
methodological revolution in macroeconomics in the 1970s by rejecting as invalid any
model that was not based on rational agents maximizing their welfare on the basis of
the information available to them. This meant that many of the Keynesian workhorse
models of the time had to go, and they replaced them with models based upon
“microeconomic foundations.” Furthermore, they claimed that econometric studies
that employed these models yielded meaningless results – they could only show
correlation, not causation, and thus could have no predictive power. Perhaps the
reason why this methodological revolution was so important is that these new models
allowed for a much richer, more complex application of mathematics to the solution
of such models.
Unfortunately, what the rational expectations models gained in terms of
mathematical richness, they lost in terms of applicability to empirical, real-world
problems. In fact, this is the reason that Keynesian economics originally departed
from classical models based upon microeconomic foundations. Taken by themselves,
models that assume welfare-maximizing behavior and perfect markets have difficulty
explaining problems such as why recessions occur and why monetary policy has real
effects on the economy – full and instantaneous adjustment by rational agents
precludes the possibility of these phenomena.
This can be demonstrated by looking at Lucas and Sargent’s critique of
discretionary monetary policy. They reject the implicit Keynesian assumption that
people can be fooled indefinitely into increasing economic output when monetary
policy is loosened without ever adjusting their expectations of future inflation. But
taking this critique to its logical conclusion, they argue that changes in monetary
policy will never influence real economic output unless they are unexpected, because
people will always completely adjust their behavior when policy is predictably
changed. To assume otherwise, one must assume either that the government is more
intelligent than private individuals, which the authors reject, or that they have access
to more information. It is only by making unexpected changes in policy (because of
privileged information) that the central bank can prevent or delay people from
adjusting their behavior to the policy change and, thus, generate real effects on
output.64 But if this is true, discretionary policy can only have a destabilizing effect

63Lucas and Sargent, op cit.
64Robert Lucas, “An Equilibrium Model of the Business Cycle” Journal of Political Economy,
v.83, n.6, Dec 1975, p. 1113.

on the economy, and the central bank should be restrained from behaving
unpredictably. 65
Similarly, many economists posited the existence of a political business cycle,
where policymakers would be tempted to exploit short-run tradeoffs between inflation
and unemployment at election time, to the detriment of long-run price stability.66
Even in the absence of political pressures, policymakers may find unanticipated
inflation to be beneficial in the short run, even if it is harmful in the long run. For
instance, policymakers may find an unanticipated inflationary monetary policy useful
when the country is faced with war, as has always happened historically, or an oil
shock, as happened in the 1970s.67 People may be fooled by unanticipated inflation
at first, and if the policymaker’s time horizon is short enough, the policymaker would
not care if people cannot be fooled a second time. But society is worse off because
once the central bank loses its credibility, monetary policy would be less effective in
the future.
Another aspect of rational expectations methodology with important
ramifications for monetary policy is the use of a mathematical method known as
dynamic programming. Dynamic programming allows economists to model the way
individuals make decisions over time. In this process, an individual’s decisions today
depend on decisions in the future. The future may be uncertain, but the individual
takes that into account when making decisions today. Dynamic programming relates
to monetary policy (and any other action by the government) through its implication
that individuals have already made their optimal decisions based on their knowledge
of future uncertainty. Thus, their well-being cannot be enhanced by changing policy
when circumstances change. In fact, it makes them worse off, by creating more
uncertainty – if individuals knew that monetary policy would have been changed in,
say 2001, they would not have made the decisions they made in 2000.
Economic events in the 1970s seemed to confirm the rational expectations
critique – Lucas and Sargent refer to Keynesian forecasting models in the 1970s68
“econometric failure on a grand scale.” The ability of the government to use fiscal
and monetary policy to achieve low unemployment and low inflation seemed to
collapse. Consensus among macroeconomists in the 1960s held that fiscal and
monetary policy could hold inflation and unemployment constant at 4% – instead,
unemployment reached 8.5% and inflation reached 9.1% in 1975.
Lucas’ and Sargent’s work did a great deal to force economists to re-examine
their belief that discretionary policy could be used to “fine tune” an economy with
better results than a simple rule akin to Milton Friedman’s money growth rule, and
spurred research to find new rules superior to Friedman’s rule. Their contribution is

65Lucas and Sargent, op cit, p. 63.
66William Nordhaus, “The Political Business Cycle,” Review of Economic Studies, v. 42,

1975, p. 169.

67Robert Barro and David Gordon, “Rules, Discretion, and Reputation in a Model of
Monetary Policy, Journal of Monetary Economics, v. 11, 1983, p. 101.
68Lucas and Sargent, op cit, p. 57.

uncertainty by making interest rate changes predictable and dependent solely on
changes in economic data. By removing the Fed’s discretionary powers, the Taylor
rule is also meant to remove its ability to “fool” people in order to exploit short-term