This paper examines the choice of a monetary-policy rule in a simple macroeconomic model. In a closed economy, the optimal policy is a output and inflation. In an open economy, the optimal rule changes in two ways. First, the policy instrument is a Conditions Index the exchange rate. Second, on the right side of the rule, inflation is replaced by filters out the transitory effects of exchange-rate movements. The model also implies that pure inflation targeting is dangerous in an open economy, because it creates large fluctuations in exchange rates and output. Targeting long-run inflation avoids this problem and produces a close approximation to the optimal instrument rule.

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Policy Rules for Open Economies

This paper employs stochastic simulations of a small structural rational expectations model to investigate the consequences of the zero bound on nominal interest rates. We find that if the economy is subject to stochastic shocks similar in magnitude to those experienced in the U.S. over the 1980s and 1990s, the consequences of the zero bound are negligible for target inflation rates as low as 2 percent. However, the effects of the constraint are non-linear with respect to the inflation target and produce a quantitati vely significant deterioration of the performance of the economy with targets between 0 and 1 percent. The variability of output increases significantly and that of inflation also rises somewhat. Also, we show that the asymmetry of the policy ineffectiveness induced by the zero bound generates a non-vertical long-run Phillips curve. Output falls increasingly short of potential with lower inflation targets.

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Price Stability and Monetary Policy Effectiveness when Nominal Interest Rates are Bounded at Zero

Previous analyses of the implementation of inflation targeting are extended to monetary policy responses to different shocks, consequences of model uncertainty, and effects of interest rate smoothing and stabilization Model uncertainty, output stabilization, and interest rate stabilization or smoothing all call for a more gradual adjustment of the conditional inflation forecast toward the inflation target The conditional inflation forecast is the natural intermediate target during inflation targeting The optimal way of reacting to shocks is hence to check how they affect the inflation forecast and then take the appropriate action

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Inflation Targeting: Some Extensions

This thesis contains four chapters, each of which examines different aspects of the uncertainty facing monetary policymakers.''Monetary policy and market interest rates'' investigates how interest rates set on financial markets respond to policy actions taken by the monetary authorities. The reaction of market rates is shown to depend crucially on market participants' interpretation of the factors underlying the policy move. These theoretical predictions find support in an empirical analysis of the U.S. financial markets.''Predicting monetary policy using federal funds futures prices'' examines how prices of federal funds futures contracts can be used to predict policy moves by the Federal Reserve. Although the futures prices exhibit systematic variation across trading days and calendar months, they are shown to be fairly successful in predicting the federal funds rate target that will prevailafter the next meeting of the Federal Open Market Committee from 1994 to 1998.''Monetary policy with uncertain parameters'' examines the effects of parameter uncertainty on the optimal monetary policy strategy. Under certain parameter configurations, increasing uncertainty is shown to lead to more aggressive policy, in contrast to the accepted wisdom.''Should central banks be more aggressive?'' examines why a certain class of monetary policy models leads to more aggressive policy prescriptions than what is observed in reality. These counterfactual results are shown to be due to model restrictions rather than central banks being too cautious in their policy behavior. An unrestricted model, taking the dynamics of the economy and multiplicative parameter uncertainty into account, leads to optimal policy prescriptions which are very close to observed Federal Reserve behavior.

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Monetary Policy with Uncertain Parameters

Current monetary policy involves the manipulation of the Central Bank interest rate (the repo rate), with the specific objective of achieving the goal(s) of monetary policy. The latter is normally the inflation rate, although in a number of instances this may include the level of economic activity (the U.S. Federal Reserve monetary policy is a good example of this category). This raises two issues. The first is the theoretical underpinnings of this mode of monetary policy. The second is the channels of monetary policy or, more concretely, the channels through which changes in the rate of interest may affect the ultimate goal(s) of policy. Both aspects are investigated in this paper. Furthermore, we suggest that it is imperative to consider the empirical estimates of the effects of monetary policy. We summarise results drawn from the eurozone, the U.S. and the UK and suggest that these empirical results point to a relatively weak effect of interest rate changes on inflation. We also suggest, on the basis of the evidence adduced in the paper, that monetary policy can have long-run effects on real magnitudes. This particular result does not fit comfortably with the theoretical basis of current thinking on monetary policy.

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John B. Taylor

Papers

The inflation/output variability trade-off revisited