Board of Governors of the Federal Reserve System
International Finance Discussion Papers
Number 982, October 2009  Screen Reader Version*
NOTE: International Finance Discussion Papers are preliminary materials circulated to stimulate discussion and critical comment. References in publications to International Finance Discussion Papers (other than an acknowledgment that the writer has had access to unpublished material) should be cleared with the author or authors. Recent IFDPs are available on the Web at http://www.federalreserve.gov/pubs/ifdp/. This paper can be downloaded without charge from the Social Science Research Network electronic library at http://www.ssrn.com/.
Abstract:
We introduce a novel method for estimating a monetary policy rule using macroeconomic news. Market forecasts of both economic conditions and monetary policy are affected by news, and our estimation links the two effects. This enables us to estimate directly the policy rule agents use to form their expectations, and in so doing flexibly capture the particular dynamics of policy response. We find evidence that between 1994 and 2007 the marketperceived Federal Reserve policy rule changed: the output response vanished, and the inflation response path became more gradual but larger in longrun magnitude. In a standard model we show that output smoothing caused by a larger inflation response magnitude is offset by the more measured pace of response. Our response coefficient estimates are robust to measurement and theoretical issues with both potential output and the inflation target.
Keywords: Monetary policy rule, market perceptions, Taylor Rule, Fed funds futures
JEL classification: E43, E52, E58
A large literature estimates monetary policy rules of the form proposed by Taylor (1993) that relate the realized fed funds rate to past or expected future indicators of output and inflation. Examples include Evans (1998), Clarida, Gali, and Gertler (2000), Rudebusch (2002), Owyang and Ramey (2004), Boivin (2006), Ang, Dong, and Piazzesi (2007), and Smith and Taylor (forthcoming). That kind of estimation is well suited to describe what policy rule the Fed has actually followed.
However, there is also considerable interest in what market participants expect the Fed to do. Expectations of future monetary policy are a key part of the monetary transmission mechanism in virtually any macroeconomic model. The Federal Reserve's expected future policy rate influences current interest rates immediately upon the market learning about the Federal Reserve's intentions to stimulate or curtail economic behavior (Hamilton (2008)). Moreover, Federal Open Market Committee (FOMC) statements provide guidance for the direction of future policy rates and are responded to instantaneously by the market upon their public release (Kohn and Sack (2004)).
This paper proposes a novel method that enables us to uncover the market's perceived monetary policy rule. Like many previous researchers (e.g., Gürkaynak, Sack, and Swanson (2005), Faust, Rogers, Wang, and Wright (2007), and Bartolini, Goldberg, and Sacarny (2008)), we identify news by the difference between a macroeconomic data release value and the value expected beforehand by the market. On this news day, we measure the news' effects on economic fundamentals' forecasts and monetary policy forecasts, the latter coming from the change in market prices for fed funds futures contracts. Our contribution is to use a TaylorRule structure to link the fundamentals forecast updates with the policy forecast updates in order to estimate the marketperceived parameters for a Taylor Rule.
Our methodology opens up to researchers the use of daily data, which offers three advantages we highlight. First, by looking at the response of fed funds futures prices for contracts of different horizons to a new data release, we are able to measure how long the market believes it will take the Fed to adjust interest rates in response to changing fundamentals. We can thereby obtain new measures of the nature of monetary policy inertia, something that is difficult for traditional methods to estimate.^{5} We document a change in the market's perception of the Fed's policy rule in terms of both the magnitude of the ultimate response and in the degree of inertia. Since 2000, the marketperceived monetary policy rule involves an eventual response to inflation that is bigger than that associated with perceived pre2000 behavior. On the other hand, the market also believes that the Fed is more sluggish in making its intended adjustments. We show in simulations with a simple newKeynesian model that the first feature would tend to stabilize output, whereas the second feature would be destabilizing. These simulations suggest that the "measured pace" of monetary tightening during 20042006 may have been counterproductive.
Second, our approach offers a cleaner answer for how to handle realtime versus revised data sets, by focusing on market expectations formed on the basis of the information as it had actually been publicly released as of a particular calendar date.
Third, our approach is robust to estimation problems engendered by potential output and the inflation target. Potential output is tricky to define and measure in real time (Orphanides and van Norden (2002)), and Orphanides (2001) argues that this can confound policy rule estimation. On the other hand, the Fed's inflation target is unobservable, and moreover a growing literature, including Ireland (2007) and Cogley and Sbordone (2008) among others, has postulated an important historical role for lowfrequency variation in the Fed's inflation target. The latency of potential output and the inflation target poses a problem for standard policy rule estimation methods because their values are necessary for measuring the explanatory variables. Our method uses daily data to difference out these slowly moving latent variables from the estimation equations.
The remainder of the paper is structured as follows: Section 2 introduces our framework and its testable implications. Section 3 discusses the empirical strategy based on these implications and describes the data. Section 4 presents our baseline full sample results, and then shows evidence of time variation in perceived policy response and estimates parameters on subsamples. Section 5 generalizes the approach to estimation of a Taylor Rule with lagged adjustment dynamics and discusses the economic significance of those dynamics. We investigate the sensitivity of our conclusions to various assumptions and variable decisions in Section 6. Section 7 concludes.
We begin with a standard Taylor Rule that is assumed by the market to characterize Federal Reserve decisions. Let represent a particular month and the average daily effective fed funds rate for that month. The market assumes that the Fed sets the funds rate in response to the Taylor Rule variables , the deviation from target of cumulative inflation between and , and , a measure of the real output gap in :
(2.1) 
where is real output growth and is potential real output growth.
We will be keeping careful track in this analysis of exactly when data of different sorts arrives. Let denote the information set that is actually available to market participants as of the th day of month ; let denote the Fed's information set at that time. The formulation (2.1) assumes that the Fed knows the values of and at the time it sets even though and would not be known to market participants until some later time. The framework is readily generalizable to a case where the Fed instead sets on the basis of information available as of some day within month :
(2.2) 
Consider the expectation of (2.1) conditional on information available to the market as of the th day of an earlier month :
(2.3) 
Alternatively, if we take expectations of (2.2) conditional on the information set , the identical equation (2.3) follows due to the Law of Iterated Expectations.^{6} In either case, we obtain the following expression for the change in expectations between the th day and the previous day of month :
(2.4)  
Equation (2.4) is the key to what follows, stating that updates to the market forecast of future policy are linked to updates to the market forecast of future economic conditions via the marketperceived monetary policy rule.
We will consider a set of different days within month on which particular information becomes available. Consider first which we associate with the release of, say, the CPI. Let denote the day in month on which a new inflation number (namely, the value of is released. For example, for December 2008, the CPI data reported on December 16 ( was the value for November 2008 (so that became known on Consider then the initial report of the value of on day . We will proxy the news content of this report by comparing the actual value with the value expected by the market, which we denote :
The CPI announcement of (arriving on ) has an implication for what market participants would have expected to turn out to be. We propose to model this implication by a linear equation forecasting on the basis of , and , where denotes a vector of other variables that would have been known to market participants prior to the day of month :
(2.5) 
The first subscript ( on the coefficients indicates that this is a coefficient used to forecast subsequent inflation, and the second subscript (1) indicates that the forecast is formed on the day on which the first information variable (the CPI) is released. Note that the coefficients in equation (2.5) are defined as linear projection coefficients, so that is uncorrelated with , , and by the definition of , , and . The consequences of the month day news release about for market expectations of are then given by
(2.6) 
where we will subsume the dependence of on when it is clear from the context.
The announcement of may also hold implications for market expectations about real output , which we proxy analogously as
(2.7) 
Note that certain elements of and may be set to zero, depending on what elements of forecast or .
Let denote the futures interest rate on day of month for a fed funds futures contract based on the effective fed funds rate months ahead. We propose that these fed funds futures offer us a direct observation on how the market expectation of changed on day :
(2.8) 
Here captures the average change in the risk premium on fed funds futures contracts and any change in the risk premium relative to that average. In the absence of risk aversion in the fed funds futures markets, the terms and would be identically zero. There is certainly good evidence for supposing the contribution of risk aversion to daily changes in fed funds prices to be small; see Piazzesi and Swanson (2008) and Hamilton (2009).^{7} In the estimation strategy adopted here, any changes in the risk premium, along with changes in the market's expectation of the residual in the Taylor Rule, changes in the market's expectation of the inflation target, and changes in the market's expectation of potential output growth, are incorporated into a specification error ,
(2.9)  
Substituting (2.6), (2.7), (2.8), and (2.9) into (2.4), we have
Consider next a second news release in month , namely the real activity indicator released on day . For these days we employ the auxiliary forecasting equations
where is known prior to day . From these we derive
In general, if some indicator is released on day we have the following three equations:
(2.10) 
(2.11) 
(2.12) 
Let denote the vector including the day release of and the information available as of the day before, where we assume that is uncorrelated with , and . Similarly, we take to be uncorrelated with and , for . Thus our identifying assumption is that the following vector has expectation zero:
(2.13) 
Note that the ability to distinguish from results from using at least different news releases during month . A single release such as the inflation number could in principle have implications both for future inflation (as captured by ) and future output (as captured by Hence any response of the fed funds futures prices to that news could come from either the policy rule inflation coefficient ( or output coefficient ( However, and are each separately observable (from the differing responses of and to ), so the change in the futures price on tells us one linear combination (namely of the policy rule parameters and But the separate response to the output release on day gives us a second linear combination ( . Thus, the equations above are sufficient to identify and separately.
For each month there are days of interest, for the number of economic indicators under consideration. Identification of this system is achieved so long as it is not the case that any one indicator always arrives on the same day as another indicator.^{8} Of course, it is all right for any two indicators occasionally to arrive on the same day.
We begin this section by describing the formal estimation strategy, which is Hansen's (1982)generalized method of moments. Then we describe the data used.
Recall that . Denoting
we rephrase (2.13) as the following population orthogonality condition for each ,
(3.1) 
where collects the auxiliary forecasting parameters along with the main parameters of interest, the policy rule coefficients . Let be the vector of all observations for each choice of horizon . Then we have the sample average
(3.2) 
As usual, the optimal weighting matrix is given by the inverse of the asymptotic variance of the sample mean of . In turn, we calculate a heteroskedasticity and autocorrelation robust estimate of this asymptotic variance, and the efficient GMM estimator uses the inverse of this HAC estimate as the weighting matrix, with the following asymptotic approximations:
and 
Since is nonlinear in , the minimization of (3.2) is achieved numerically. Our results are calculated by twostep GMM starting from an initial guess provided by a simple twostage OLS procedure and with other initial conditions considered to obtain some assurance that the global optimum has been found.^{9} The inconsistent twostage OLS procedure would instead first estimate the auxiliary forecasting equations independently, then use these forecast parameter estimates to generate regressors for the Taylor Rule regression.^{10} Joint estimation by (nonlinear) twostep GMM is consistent and efficient  see Newey and McFadden (1994).^{11} We estimate each horizon independently from the others so that nothing other than the original data links these estimates to one another.
As mentioned, identification is achieved by considering at least two indicators , in which case the system (3.2) in general is justidentified. When we use more than two indicators, the system naturally delivers overidentifying restrictions. Additionally, we can impose crossequation restrictions that create overidentification. Our baseline specification is overidentified for both reasons.
Our data set consists of particular days for each month over the period 1994:M1 through 2007:M6. Data on fed funds futures contracts come from the Chicago Board of Trade. Fed funds futures are accurate predictors of the effective fed funds rate, as documented in numerous studies including Evans (1998), Gürkaynak, Sack, and Swanson (2007), Piazzesi and Swanson (2008), and Hamilton (2009). We restrict our attention to fed funds futures traded after 1994. One reason, as noted by Gürkaynak, Sack, and Swanson (2007), is that the Federal Open Market Committee began announcing the fed funds target in 1994, and this change in procedure could cause changes in the forecasting relations. In addition, the trading volumes pick up noticeably during this year.^{12} At the other end of the sample period, we end our data at 2007:M7 in order to avoid the period of major financial disruptions that started in the late summer of 2007 following the fund freezes by BNP Paribas in early August.
We measure inflation by the yearoveryear growth rate of the CorePCE price index from the BEA. This has been the Federal Reserve's key inflation indicator over the sample we consider. We measure output growth by the yearoveryear growth rate of industrial production from the Federal Reserve Board. To use as much data as possible we stay at the monthly frequency and therefore require a monthly output growth series. Industrial production growth has been used by previous studies to proxy for overall output growth (e.g. Stock and Watson (2002)) and is a natural candidate for our baseline. As a robustness check we will consider another measure for output growth, Macroeconomic Advisers' monthly GDP.
The economic indicators we consider are data releases from various government agencies that are followed by the Money Market Survey (MMS). Following Gürkaynak, Sack, and Swanson (2005), the median forecast provides a proxy for each variable's market expectation. MMS provides market expectations for several candidate economic indicators. Our choice is guided by asking which economic variables might be most helpful for forecasting output growth and core PCE inflation. It is natural for this purpose to use core CPI inflation (CPIXFE) and industrial production (INDPRD) themselves.^{13} In addition, the macroeconomic announcement literature has noted that market participants scrutinize and respond to nonfarm payroll employment (Gürkaynak, Sack, and Swanson (2005), Bartolini, Goldberg, and Sacarny (2008)), and so we will consider that indicator (NFPAY) as well. It is worth noting that NFPAY and the unemployment rate are released on the same day each month, in the BLS Employment Situation report. As mentioned above, this implies that either one of these, but not both, can be used in estimation. Given the importance of NFPAY found by prior studies, this steers us away from the unemployment rate as an indicator. This in turn makes the unemployment rate less attractive a proxy for output growth, since we would naturally then use it as an indicator.
In terms of the variables entering the auxiliary forecasting equations, we set
The lagged values of inflation and output growth are included to control for their autoregressive nature. For parsimony, we set to zero the first element of , the coefficient on in indicator 's auxiliary forecasting equation for ; likewise, we zero out the second element of , the coefficient on in indicator 's auxiliary forecasting equation for . The fed funds futures prediction for the day before is included to control for the predictive content (visavis each Taylor Rule variable) of the futures price that has already been priced into the contract.
First we present our baseline fullsample results using three indicators. We then show that statistical tests of our overidentifying restrictions fail to reject our baseline model, along with other specifications considered for robustness. Motivated by related literature, we run tests for breaks in the policy rule parameters and find evidence of their variation over time. Placing the break around the beginning of the year 2000, we present subsample estimates suggesting the marketperceived monetary policy rule has changed over time, and repeat the overidentification tests on the separate subsamples.
Our baseline results use three indicators  CPIXFE, INDPRD, and NFPAY  and impose the crossequation restriction that the average risk premium change is identical across indicators:
(4.1) 
This crossequation restriction embodies the assumption that the different economic indicators systematically affect the forecasted policy rate only through changes to forecasted inflation and output, and it adds statistical precision to our estimates; we further discuss and test this restriction in Section 6. The policy rule response coefficient estimates are presented in Table 1, and we note a few features deserving mention.^{14}
Table 1. MarketPerceived Monetary Policy Rule Estimates, Baseline
h=1  h=2  h=3  h=4  h=5  h=6  

0.3423 0.2046 
0.8723** 0.1496 
1.3487 0.7757 
1.1114** 0.4305 
1.1068* 0.5118 
1.3733 0.7252 

0.0510** 0.0092 
0.0279 0.0204 
0.1603** 0.0361 
0.1258** 0.0306 
0.1429** 0.0438 
0.1938** 0.0702 
Notes: The policy rule coefficient on inflation is and on the output gap is . HAC standard errors in italics. The markers * and ** denote significance at 5% and 1% levels, respectively. There are 160 observations for , 159 for , etc. The indicators are CPIXFE, INDPRD, and NFPAY. Point estimates and standard errors from twostep nonlinear GMM. Data run over 1994:M12007:M7.
First, we obtain reasonably precise estimates of the marketperceived policy response to inflation. Horizons two, four, and five all exhibit inflation response coefficients that are significant at the 5% level, and coefficients for the remaining horizons are significant at the 10% level. The output response coefficient is statistically significant and positive at the 1 level for all horizons except the second. These results suggest that our empirical methodology effectively extracts information from market forecast updates that occur in response to macroeconomic news.
Second, the market does not expect the Fed to implement changes immediately. The response coefficients at longer horizons tend to be larger than the response coefficients at shorter horizons, and 95% confidence intervals for or often exclude the point estimates obtained for different . Recall that the units of the inflation response coefficients are identical across horizons, as are the coefficients on output. These parameters answer the question: looking months ahead, what is the response of the forecasted policy rate to a one unit increase in the forecasted rate of inflation or output growth? This feature of the results strongly suggests that the market believes the Fed gradually adjusts policy in response to economic fundamentals, a point we explore further in Section 5.
We next evaluate the appropriateness of the assumptions behind these estimates. We first investigate Hansen's (1982) tests of overidentifying restrictions given by
(4.2) 
for the number of overidentifying restrictions. The values for this test are presented in Table 2. Recall that our baseline specification overidentifies the model both by using three indicators and by imposing that the policy rule specification error means are identical for these indicators (equation (4.1)). Row 1 displays the values associated with the statistics for the baseline specification. We fail to reject at the 5% level the overidentifying restrictions for every horizon , offering some confirmation that our basic framework is consistent with the data.
Papers including Clarida, Gali, and Gertler (2000), Primiceri (2006), and Boivin (2006) have argued that U.S. monetary policy has changed over time. Unfortunately, our data are not available for the period over which those papers find the most dramatic policy changes. Nonetheless, if monetary policy changed once, then it could change again  and market participants are aware of this possibility. We therefore ask whether market participants' perception of the monetary policy rule have changed over time.
Table 2. Overidentification Tests, Baseline
h=1  h=2  h=3  h=4  h=5  h=6  

(1) BASELINE  0.1176  0.1172  0.1099  0.1006  0.1222  0.1044 
(2) BASELINE, PRE  0.3657  0.4600  0.3881  0.3827  0.4038  0.4068 
(3) BASELINE, POST  0.2790  0.2879  0.2756  0.2963  0.3018  0.3045 
Notes: values from Hansen's (1982) test of overidentifying restrictions, for the baseline specifications. BASELINE is the baseline specification estimated over the full sample. BASELINE, PRE and BASELINE, POST are the baseline specifications estimated over the pre2000 and post2000 subsamples, respectively.
To answer this question, we test for a break in the parameters of interest. Using Andrews's (1993) break test, we test the null hypothesis that all parameters are constant against the alternative that the policy rule coefficients , , and experienced a break.^{15} Letting the policy rule coefficient vector be , we test:
for values of in (0.25,0.75). We use the supWald statistic and tabulated critical values in Andrews (1993).
For each horizon considered, there is strong evidence of a break in the policy rule coefficients . In particular, for our application the 1 critical value is 16.6: the supWald statistic is estimated to be 204.3, 190.2, 170.6, 168.4, 142.0, and 123.1 for horizons 1 through 6, respectively. Moreover, these maximal statistics occur at nearly the same time for every horizon, at the beginning of the year 2000. In light of this evidence, we reestimate our baseline model on the pre2000 and post2000 subsamples.
Returning to the overidentification test results of Table 2, rows 2 and 3 display the values for the model estimated across horizons on each subsample. We now find that the model is readily accepted for each subsample. Evidently, the break in the policy parameters was a factor in the lower full sample values in row 1. Once the parameters are allowed to differ by subperiod, we find no evidence against our framework.
Table 3. MarketPerceived Monetary Policy Rule Estimates, Baseline Pre2000 and Post2000
h=1  h=2  h=3  h=4  h=5  h=6  

PRE2000   0.3611 0.2173 
0.8309* 0.3717 
1.2049* 0.4708 
1.2125 0.7954 
1.1116* 0.4630 
1.3821 0.7610 
PRE2000   0.1550** 0.0349 
0.1284** 0.0314 
0.2641** 0.0670 
0.3968** 0.1142 
0.3844** 0.1364 
0.5744** 0.1436 
POST2000   0.1465** 0.0537 
0.3797** 0.0673 
0.4292* 0.2110 
0.5913** 0.1318 
0.8237** 0.1694 
2.2240* 0.9529 
POST2000   0.0366** 0.0127 
0.0034 0.0071 
0.0474 0.0248 
0.0544* 0.0277 
0.0401 0.0297 
0.0777 0.0834 
Notes: The policy rule coefficient on inflation is and on the output gap is . HAC standard errors in italics. The markers * and ** denote significance at 5% and 1% levels, respectively. pre2000, there are 69 observations for , 68 for , etc.; post2000, there are 88 observations for , etc. The indicators are CPIXFE, INDPRD, and NFPAY. Point estimates and standard errors from twostep nonlinear GMM. Data run over 1994:M12007:M7
Table 3 displays the estimation results for the two subsamples. We now discuss the output and inflation response coefficients estimated in each subsample and how they differ from one another.
Looking at the output response coefficients, the output response during the 1990s is moderate but tightly estimated. At all horizons the point estimates are positive and significant at the 1% level. The response is around 0.15 in the first month, rising to 0.57 by the sixth month, and hence the policy response exhibits gradual adjustment. However, during the 2000s the response to output changes dramatically. For half of the horizons the output response is a tightly estimated zero, while for the remaining horizons the response is small and insignificant. Taken together, this evidence suggests that during the 1990s the market perceived a moderate output gap response that essentially vanished during the 2000s.
Looking now at the inflation responses, we see two noteworthy differences across the subsamples. First, the pre2000 estimates are not as precisely estimated as the post2000 estimates. Prior to the year 2000 none are significant at 1% level. On the other hand, post2000 all horizons are statistically significant at the 5% level, with four horizons significant at the 1% level. This suggests that the more recent period has seen greater signal, relative to noise, in the market forecast updates to policy and fundamentals.
Second, the post2000 inflation response is lower at short horizons and higher at the long horizon. For the first four months after an inflation forecast increase, the forecasted policy response during the 2000s is half what it was during the 1990s. For these early horizons we can reject at the 1% level that the post2000 inflation responses are equal to their pre2000 estimated values. At the long horizon, the post2000 sixmonth horizon response (2.22) is about 50% greater than the pre2000 sixmonth horizon response (1.38). During the 1990s, policy followed the Taylor Principle (a morethan oneforone response of nominal rates to inflation) by the third month after a shock to forecasted inflation; during the 2000s, policy has met this principle only by the sixth month.
Together, these observations suggest that the marketperceived policy response to inflation changed over time in two distinct ways: during the 1990s the response adjusted at a quicker pace with a moderate longrun magnitude, while during the 2000s the response adjusted at a slower pace with a larger longrun magnitude.
Up to this point in the paper we have been investigating a static Taylor Rule of the form of equation (2.1). We found that the implied market expectations of how the Fed would respond to news turned out to be a function of the time horizon , meaning that the Fed is implicitly assumed by the market to implement the policy changes warranted by the news only gradually. We next formulate a more detailed specification of the nature of that lagged response that is consistent with the observed market behavior, developing and calibrating a dynamic Taylor rule. Section 5.3 then explores the implications of these changed dynamics using a simple newKeynesian model.
We first modify the earlier notation to make the dependence on the horizon explicit, rewriting the periodahead forecasting equations (2.11) and (2.10) as
(5.1) 
(5.2) 
We will also now need a version of equations (5.1) and (5.2) for the case , in order to keep track of the implication of the release of one indicator for the values of other indicators to be released later that month. Suppose that the first indicator released in month is NFPAY, denoted here as . That release could cause us to update our expectation of the values for INDPRD ( ) and CPIXFE ( ) that will be reported later that same month according to
(5.3) 
(5.4) 
Thus for example estimates of and could be obtained by OLS estimation of (5.3) and (5.4). Later in month when the output indicator is released, that allows us to know the value of with certainty, which to preserve the general notation we would represent by , and would also induce an update to the forecast for ,
(5.5) 
When is finally released, it has no implications for which is already known ( ) and changes our forecast of inflation oneforone ( ).
Consider now the following dynamic generalization of (2.1):
(5.6) 
Unlike our earlier expression (2.2), equation (5.6) is strictly a backwardlooking formulation, presuming that the Fed responds dynamically to the history of available information; note that and are the most recent values available as of the end of month .
Recall that the value of is released on day , and let denote the interest rate implied by a futures contract for settlement based on the value of , and quoted as of the end of trading on day . For example, would reflect an expectation of the current month's fed funds rate on the day that the indicator is released. Take the expectation of (5.6) conditional on market information available on day and subtract from it the expectation formed the day before:
(5.7)  
For comparison, recalling that , we can rewrite equation (2.12) as
(5.8) 
where and denote the original parameters whose estimates we reported in column of Tables 1 or 3. Comparing equations (5.7) and (5.8), the values of the dynamic parameters in (5.6) are related to our baseline estimates according to
(5.9) 
To arrive at estimates of the dynamic parameters, we chose so as to minimize the equallyweighted sum of squared differences between the LHS and RHS of (5.9) across indicators and horizons . On the RHS, the values for for were taken from the earlier splitsample GMM estimation reported in Table 3, while values for were obtained from GMM estimation of , , , , and based on the moment conditions
(5.10) 
where as before denotes information available the day prior to release of . This last GMM estimation resulted in the estimates for the pre2000 subsample, and after 2000. For all the above calculations, the values , , and were imposed throughout.
The resulting values of and are reported in Table 4. In the last column is the sum of the parameter values across all , which gives the longrun response to the inflation or output pressure.
Table 4. Dynamic Taylor Rule Parameters
j=1  j=2  j=3  j=4  j=5  j=6  j=7  sum  

PRE2000   0.3629  0.0009  0.8859  0.0994  0.2395  0.0542  0.0464  1.2874 
PRE2000   0.1760  0.0102  0.0147  0.0399  0.1692  0.0674  0.0343  0.2585 
POST2000   0.0848  0.0830  0.3642  0.2760  0.4918  0.1552  0.4330  1.5780 
POST2000   0.0060  0.0140  0.0040  0.0414  0.0442  0.0302  0.0102  0.0592 
Notes: from minimumdistance method described in text, using subsample parameter estimates across all horizons.
Recall from Section 3.1 that the parameter vector for horizon was estimated completely independently from any other horizon. This approach of leaving the dynamics implied by completely unrestricted offers at least two benefits. First, nothing in our procedure requires that the longhorizon responses should be bigger than the shorthorizon responses. The fact that we nonetheless find them to be increasing in is strong evidence that the market perceives policy to respond only gradually to changing conditions. Second, our procedure allows the adjustment to inflationary pressures to differ from the adjustment to real activity, similar to the policy rules of Christiano, Eichenbaum, and Evans (1996, 2005). Table 4 implies different paths in the response of policy to inflation and output. For example, the pre2000 response to inflation jumps up at the threemonth lag () while the response to output stays relatively steady until the 5month lag (). This flexibility in the rule's process is greater than that permitted by including only lags of the policy rate itself, and our estimates suggest this greater flexibility is warranted by the data.
We now explore the implications of the estimated changes in the Taylor Rule for the consequences of monetary policy. Following Clarida, Gali, and Gertler (2000), we use a standard stickyprice, rational expectations model whose equilibrium conditions, loglinearized around a zero inflation steady state, are
(5.11)  
(5.12)  
(5.13) 
The first equation (5.11) says that inflation today is a function of the output gap and the expectation of next period's inflation, which in turn can be derived from an underlying Calvo pricing structure. With relative risk aversion measured by , equation (5.12) is an IS schedule where today's output depends on the ex ante real rate and the expectation of next period's output gap. Equation (5.13) is a dynamic Taylor Rule that closes the model. The model is driven by autocorrelated demand shocks and supply shocks with the same unconditional variance. We take parameter values from Clarida, Gali, and Gertler (2000) and set , , , and the shocks' autocorrelation to 0.9655 in our monthly model.
Our goal is to characterize what difference the inflationresponse parameters might make for the volatility of macro variables according to this model. To do so, we fix at the pre2000 values, and calculate the difference in volatilities using pre2000 and post2000 values for . We find that the post2000 dynamics imply a 41.2% reduction in the variance of inflation, a 0.2% reduction in the variance of output, and a 33.5 reduction in the variance of the fed funds rate. Alternatively, we fixed the output dynamics at the post2000 values, and calculated how much difference the change in inflation dynamics made for that specification, with very similar results. These comparisons are reported in the last column of Table 5.
We next wanted to see what it was about the post2000 inflation response that helped stabilize inflation. Was it the overall magnitude of the inflation response, as reflected in the sum of the coefficients, or was it the more gradual post2000 response, as reflected in the shape of the dynamic response? To find out, we explored the consequences of changing just one of these two elements at a time. Let denote the pre2000 inflation responses and the post2000 responses. We calculated what would happen if the inflation responses were given by
so that the sum of the coefficients was restricted to be the same as for the pre2000 estimates, while the shape of was that for the post2000 estimates. These results are reported in the column labeled "postpath, preLR" in Table 5. Such a change would have only modestly improved the variance of inflation, and would have resulted in a significant deterioration in the variability of output.
Table 5. Effects of Changing Inflation Policy Response  Percentage Change in Volatility from Benchmark
Variable  Output Coefficients  Inflation Coefficient  PRE PATH PRE LR  Inflation Coefficient  POST PATH PRE LR  Inflation Coefficient  PRE PATH POST LR  Inflation Coefficient  POST PATH POST LR 

PRE 
0 
8.7 
39.3 
41.2 

POST 
0 
7.9 
40.6 
41.4 

PRE 
0 
+24.2 
17.4 
0.2 

POST 
0 
+30.9 
21.0 
+0.7 

PRE 
0 
14.0 
26.3 
33.5 

POST 
0 
15.7 
27.6 
35.6 
Notes: volatilities of endogenous variables of the stickyprice model described in text. Dynamic Taylor Rule coefficients in Table 4. PRE PATH, PRE LR is benchmark using the dynamic Taylor Rule derived from pre2000 estimates. POST PATH, PRE LR uses the dynamic Taylor Rule derived from post2000 estimates, with inflation coefficients multiplied by the ratio of the pre2000 longrun inflation response to the post2000 longrun inflation response. PRE PATH, POST LR uses the dynamic Taylor Rule derived from pre2000 estimates, with inflation coefficients multiplied by the ratio of the post2000 longrun inflation response to the pre2000 longrun inflation response. POST PATH, POST LR uses the dynamic Taylor Rule derived from the post2000 estimates. These inflation coefficient modifications are considered holding constant the output coefficients at the pre2000 values in rows marked PRE, and at the post2000 values in rows marked POST.
On the other hand, if we change just the longrun response, but leave the dynamics the same as for the pre2000 rule,
as reported in the "prepath, postLR" column of Table 5, we would have achieved the full benefits of inflation stabilization as well as additional benefits of output stabilization.
Thus the key improvement in perceived monetary policy was a stronger longrun response to inflation. The fact that the market also perceives these responses to come more slowly in the post2000 data has in fact been counterproductive.
A lesson from this basic New Keynesian analysis is the following. Increasing the longrun magnitude of inflation response, as the market perceives the Fed to have done, had a stabilizing effect both on inflation and output. Implementing the response more slowly, as the market also perceives the Fed to have done, counteracted what otherwise would have been a benefit for output volatility of the stronger eventual inflation response. The "measured pace" of monetary tightening during 20042006 could thus have been a factor contributing to unnecessary volatility of output  doing the same thing more quickly might have produced a better result.
Table 6. Specification Tests
h=1  h=2  h=3  h=4  h=5  h=6  

(4) K=2, PRE  0.0939  0.1061  0.1113  0.0975  0.0957  0.0956 
(5) K=2, POST  0.0781  0.0707  0.0721  0.0649  0.0650  0.0705 
(6) MGDP, PRE  0.3422  0.3681  0.3723  0.3725  0.3765  0.3974 
(7) MGDP, POST  0.3015  0.2816  0.2719  0.2850  0.2857  0.2859 
(8) CROSS, PRE  0.9878  0.9668  0.9185  0.9961  0.9829  0.9985 
(9) CROSS, POST  0.9999  0.9869  0.9488  0.9999  0.9999  0.9999 
Notes: values from Hansen's (1982) test of overidentifying restrictions, for various alternate specifications. K=2, PRE and K=2, POST use only two indicators (CPIXFE and INDPRD). MGDP, PRE, and MGDP, POST use monthly GDP instead of Industrial Production as the output variable. CROSS, PRE and CROSS, POST tests the crossequation restriction that the average risk premium change is identical across indicators.
We next investigate the sensitivity of our results to using alternative economic indicators, test the crossequation restrictions imposed, and look for corroboration of the identifying assumptions from other data sources.
Here we analyze the sensitivity of our baseline results to the data used. First, we report results using only two indicators. Second, we report results using monthly GDP, as calculated by Macroeconomic Advisers, instead of industrial production to measure monthly output. Given the strong evidence of a parameter break, we consider these alternate specifications estimated separately over the two subsamples. Table 6 displays the overidentification test results while Table 7 presents the response coefficient estimates.
Specifications (4) and (5) of Table 7 suggest that the nonfarm payrolls indicator provides useful variation to the estimation. In its absence, the parameter estimates are less precisely estimated at several horizons. We still estimate a pre2000 steeply adjusting inflation response, nearly identical to the baseline pre2000 estimates. And again the pre2000 output response, when statistically significant, looks to be modest. However, the longer horizon estimates are accompanied by large standard errors, rendering them statistical insignificant. Still, the overidentifying tests in Table 6 fail to reject at the 5% level.
Table 7. MarketPerceived Monetary Policy Rule Estimates, ALternate Specifications
h=1  h=2  h=3  h=4  h=5  h=6  

(4) K=2, PRE   0.3655* 0.1451 
0.8756** 0.2245 
1.1693** 0.3877 
1.1302* 0.4897 
1.0811 3.6476 
1.3718 1.9668 
(4) K=2, PRE   0.0628** 0.0136 
0.0487** 0.0166 
0.1386 0.0762 
0.1338 0.1227 
0.1875 0.6804 
0.1984 0.3485 
(5) K=2, POST   0.0737** 0.0255 
4.7939 60.3866 
0.9579 1.5374 
0.0881 0.1503 
1.0009 1.5029 
2.6046 18.1027 
(5) K=2, POST   0.0111** 0.0038 
0.1660 2.0437 
0.0357 0.1054 
0.0253 0.0208 
0.0643 0.0329 
0.2120 1.2092 
(6) MGDP, PRE   0.4059 0.2170 
0.9063** 0.1916 
1.1353** 0.2419 
1.1681** 0.2716 
1.1832* 0.4921 
1.4515 0.9977 
(6) MGDP, PRE   0.2140** 0.0615 
0.0848** 0.0197 
0.2163** 0.0418 
0.3608** 0.0593 
0.3795** 0.1101 
0.5833** 0.1910 
(7) MGDP, POST   0.0012 0.2929 
0.3985** 0.0818 
0.3923** 0.0984 
0.1520* 0.0667 
0.9583** 0.1467 
1.8190** 0.5357 
(7) MGDP, POST   0.2986 0.1678 
0.0063 0.0448 
0.1860** 0.0706 
0.1570* 0.0721 
0.0923 0.0752 
0.0533 0.1134 
(8) NO CROSS, PRE   0.3606 0.2435 
0.8534* 0.4101 
1.2100* 0.5341 
1.2124 0.8613 
1.1126 0.5899 
1.3821 0.9823 
(8) NO CROSS, PRE   0.1548** 0.0369 
0.1316** 0.0364 
0.2615** 0.0841 
0.3970** 0.1220 
0.3857* 0.1509 
0.5746** 0.2012 
(9) NO CROSS, POST   0.1425** 0.0542 
0.3656* 0.1455 
1.1842 0.6257 
0.5738** 0.1802 
0.8037** 0.2048 
2.0393 1.0932 
(9) NO CROSS, POST   0.0368** 0.0126 
0.0037 0.0091 
0.1361* 0.0621 
0.0559 0.0337 
0.0409 0.0306 
0.0691 0.0793 
Notes: The policy rule coefficient on inflation is and on the output gap is . HAC standard errors in italics. The markers * and ** denote significance at 5% and 1% levels, respectively. See the notes for Table 6 or the text of Section 6 for descriptions of the alternate specifications. Point estimates and standard errors from twostep nonlinear GMM. Data run over 1994:M12007:M7
Specifications (6) and (7) of Table 7 give evidence that our baseline results are robust to other measures of output. The pre2000 output response coefficients are very similar to the baseline, with a slightly larger 0.21 response at the onemonth horizon and virtually unchanged 0.58 response at the sixmonth horizon. The profile for the post2000 response is similar to the baseline results, again with the three and fourmonth horizon responses wrongly signed. Tests of the overidentifying restrictions in Table 6 are quite supportive of the assumptions.
In addition to the average change in the risk premium on fed funds futures contracts, the constant term in equation (2.12) would incorporate any nonzero mean for the specification error that represented daytoday changes in the market forecasts of potential output, the inflation target, and the policy rule residual (see expression (2.9)). If this constant terms turned out to be different for different indicators , that could be evidence of general misspecification. For example, if the indicators were in part providing signals about changes in potential output, and if the value of this signal differed across indicators, that might show up as differences in across different .
It is easy to conduct tests of the restriction (4.1) that the policy rule constant is identical across indicators based again on Hansen's statistic
where is the GMM parameter estimate subject to the crossequation restriction and is the unrestricted estimate. The values for this test are reported in rows 8 and 9 of Table 6. The restrictions are quite consistent with the data.
The unrestricted policy parameter estimates from are reported in rows 8 and 9 of Table 7. Nothing substantive is lost, and statistical precision is noticeably gained, by imposing the crossequation restriction that the policy rule constant is identical across economic indicators. Comparing rows 8 and 9 of Table 7 to Table 3, one sees that estimating separate policy rule constants reduces the statistical precision with which we estimate the policy rule response coefficients, in particular the inflation response coefficients at longer horizons.
A challenge for standard methods of estimating monetary policy rules is the difficulty in measuring potential output and the inflation target . We have argued that our approach can avoid these problems to the extent that the daily news items of which we make use have negligible consequences for or . Here we provide additional evidence on why we believe that is a reasonable assumption.
To explore this issue empirically, we will be looking at the properties of the Congressional Budget Office's series for quarterly potential real GDP growth, denoted where indexes quarters. If one looks at the historical values of this series as reported in the January 2009 vintage, is an extremely smooth and highly predictable series. However, over time the CBO will make many revisions to its estimate of the value of for a given historical quarter . For example, on April 17, 1996, CBO estimated the growth rate of potential GDP for 1995:Q4 to be 1.98% (at an annual rate), whereas by January 8, 2009, they had revised the estimate for up to 2.76%. Orphanides (2001) and Orphanides and van Norden (2002) demonstrated that such revisions can pose a big problem for traditional Taylor Rule estimates. Is it reasonable to assert that the daily news events exploited in our analysis had negligible implications for these subsequent revisions of potential GDP?
Let denote the information set available to the public as of the 20th calendar day of the first month of quarter . For example, for 1995:Q4, would represent information publicly reported as of January 20, 1996. By this date, values for the percentage growth in nonfarm payrolls for each month of quarter would have been reported, denoted and though the actual GDP growth rate for quarter would not yet be known. Thus for example for 1995:Q4, would be the growth rate of seasonally adjusted nonfarm payroll employment during the month of October 1995 as reported by the Bureau of Labor Statistics on January 6, 1996, while would be the November 1995 growth rate as reported on January 6. Let denote the four most recent quarterly growth rates for potential GDP as they would have been reported by CBO prior to date ; for example, for 1995:Q4, is the potential growth rate for 1995:Q3 as estimated by CBO on February 1, 1995 (the most recent CBO estimate released prior to January 20, 1996). Finally, let denote the potential GDP growth rate for quarter as reported on January 8, 2009. Vintage values for and were obtained from ALFRED, the realtime archived data set maintained by the Federal Reserve Bank of St. Louis.
We then estimated the following regression by OLS for 1994:Q1 to 2007:Q3:
The coefficients can tell us the extent to which the values of nonfarm payroll growth that arrive during quarter could help predict the potential GDP growth rate for quarter as it would ultimately be reported, relative to information about potential GDP that had arrived prior to the quarter's actual GDP report. We fail to reject the null hypothesis that ( ). On the other hand, a parallel regression for predicting the actual real GDP growth rates as eventually reported,
leads to rejection of ( ). Nonfarm payrolls contain useful information about the current quarter's actual GDP growth but little information about the current quarter's potential GDP growth.
We repeated the same calculations using monthly industrial production growth rates in place of nonfarm payroll employment growth.^{16} We again found that industrial production is of no use in predicting potential GDP ( ), but is helpful for predicting actual GDP ( ). Our maintained assumption that markets are responding to news about nearterm economic conditions and not potential output is thus fully consistent with these hypothesis tests.
As far as the inflation target is concerned, the validity of our identifying assumption seems even more compelling. Although there may be changes in the Fed's inflation objectives over time, the suggestion that the FOMC is changing its longrun inflation target on a daily basis in response to the latest economic news would seem quite strange to those who actually implement monetary policy. Apart from the discrete effects of personnel changes, the Fed's longrun inflation target should be by definition an even smoother series than potential GDP.
It is important to be able to measure market participants' beliefs, manifest through their behavior, about how monetary policy is conducted. Previous work has identified futures contract prices as powerful predictors of their underlying; in particular, fed funds futures contracts are good predictors of future Federal Reserve policy. This paper proposed that market participants forecast future policy along with future economic conditions, and linked the two by the Taylor Rule. This enabled us to measure the market's beliefs about how the Federal Reserve responds to inflation and the output gap. Additionally, by focusing on daily forecast updates, we are able to nearly eliminate the impact of potential output and the inflation target on our main focus: the marketperceived monetary policy response to inflation and output.
Our baseline results for the 19942007 sample suggest the market perceives that the Federal Reserve gradually responds to inflation and real activity. Similar to previous literature working on postVolcker data, we find the Federal Reserve follows the Taylor Principle, a greater than oneforone response to inflation. We also find evidence that the marketperceived monetary policy rule changed over our sample. During the 1990s marketperceived policy responded robustly to output and quickly to inflation; during the 2000s marketperceived policy doesn't respond to output and responds at a more measured pace to inflation, though its longrun inflation response is greater than before. We quantify the importance of the inflation response path and longrun magnitude in a standard model, and find that raising the longrun magnitude is effective at lowering inflation volatility while making the path more gradual is counterproductive. Our baseline results were found to be robust to alternative possible specifications.
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Table A1. Policy Rule Constant Estimates
h=1  h=2  h=3  h=4  h=5  h=6  

BASELINE  0.4024** 0.0787 
0.4750** 0.1031 
0.6223** 0.1351 
0.5060** 0.1223 
0.6844** 0.1041 
0.6056** 0.1046 
BASELINE, PRE  0.4085** 0.0897 
0.4744** 0.0693 
0.6187** 0.1050 
0.5288** 0.1459 
0.7056** 0.2027 
0.6310* 0.2691 
BASELINE, POST  0.4228** 0.1174 
0.5163** 0.1545 
0.6179** 0.0924 
0.5194** 0.1440 
0.6075** 0.1945 
0.6850** 0.1587 
Notes: is the average risk premium change. HAC standard errors in italics. The markers * and ** denote significance at 5% and 1% levels, respectively. Point estimates and standard errors from twostep nonlinear GMM. Data run over 1994:M12007:M7.
Figure A1. Trading Volume on Fed Funds Futures Contracts
Notes: Data from Chicago Board of Trade. As quarterly average.
1. First version: January, 2009. We thank Michele Cavallo, Joseph Gruber, Elmar Mertens, Ricardo Nunes, Robert Vigfusson, and participants of the International Finance Workshop, Midwest Macro Meetings 2009, and North American Econometric Society Meetings 2009 for helpful comments, and Michael Reynolds for research assistance. The views in this paper are solely the responsibility of the authors and should not be interpreted as reflecting the views of the Board of Governors of the Federal Reserve System or of any other person associated with the Federal Reserve System. Return to text
2. jhamilton@ucsd.edu Return to text
3. seth.j.pruitt@frb.gov Return to text
4. sborger@ucsd.edu Return to text
5. See Rudebusch (2002) and Rudebusch (2006) for alternative approaches. Return to text
6. We assume that . Return to text
7. Our method works if either the risk premium is constant, as implied by the common "expectations hypothesis" or under the implication of consumptionbased asset pricing models that the risk premium would change little on a daily basis. Piazzesi and Swanson's (2008) results indicate that "[these] risk premia seem to change primarily at businesscycle frequencies." Return to text
8. We make sure this is the case with the indicators we choose below. Return to text
9. We have tried ContinuallyUpdated GMM, but have found this makes little difference to our baseline results. Return to text
10. Since our framework introduces a generatedregressor, the twostage OLS procedure is inconsistent  see Pagan (1986). Return to text
11. Our HAC estimator is that of Newey and West (1987) with 13 lags. Return to text
12. See Figure A1 for a plot of these data. Return to text
13. MMS does not survey forecasts for CorePCE inflation, hence our reliance on CoreCPI inflation. Fortunately, CoreCPI forecasts CorePCE inflation well  further details are available from the authors upon request. Return to text
14. Estimates of the constant are reported in Table A1 of Appendix A.1. Return to text
15. The vector of parameters taken to be constant under both the null and the alternative is the vector of auxilliary forecasting parameters . Return to text
16. Release of the December 1995 value for industrial production was delayed until January 24, 1996. We used this January 24, 1996 release for 1995:Q4. Return to text
This version is optimized for use by screen readers. Descriptions for all mathematical expressions are provided in LaTex format. A printable pdf version is available. Return to text