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Beginning with the Reserve Bank of New Zealand Act of 1989, central banking reforms have focused on assigning clear goals for which monetary policy authorities can be held accountable. Inflation-targeting regimes provide examples of such goal-based policy frameworks. An alternative approach relies on a rule-based framework in which the policy authorities are judged on whether they set their instrument in a manner consistent with a legislated rule. I consider the performance of goal-based and rule-based frameworks. I first show analytically that both goal-based and rule-based systems balance a trade-off between reducing sources of policy distortions and preserving policy flexibility. Then, using an estimated DSGE model, I find the optimal weights to place on goal-based and rule-based performance measures. When the rule is similar to that proposed recently in U.S. H.R. 5108, I find that the optimal weight to assign to the rule-based performance measure is zero. However, when the rule is based on the output efficiency gap, it is generally optimal to make deviations from the rule a part of the central bank's performance measure.

During the past three years, central banks have faced challenges that few foresaw during the period known as the Great Moderation. During the crisis, central banks have responded with traditional interest rate tools, been forced to deal with the zero lower bound on nominal interest rates, and expanded the scope of their lender of last resort function. In addition, quantitative easing and credit easing policies have entered the toolkit of central banks. After briefly discussing the instruments of monetary policy and reviewing the performance of inflation targeting, I consider three suggested modifications to this policy framework. These are raising the average target for inflation, incorporating additional objectives, and switching to price level targeting.

By the end of the Great Moderation, over two dozen central banks were formal inflation targeters, and others, such as the Federal Reserve, the European Central Bank, and the Swiss National Bank behaved essentially as inflation targeters even though they were resistant to identifying themselves as such. However, the past three years have seen central banks faced with new challenges, and these have raised questions about the future of inflation targeting as a framework for the conduct of monetary policy. I consider three suggested modifications to this policy framework: incorporating additional goals among a central bank's objectives; raising the average target for inflation; and switching to price level targeting.

In this paper, I evaluate the performance deterioration that occurs when the central bank employs an optimal targeting rule that is based on incorrect parameter values. I focus on two parameters — the degree of inflation inertia and the degree of price stickiness. I explicitly account for the effects of the structural parameters on the objective function used to evaluate outcomes, as well as on the model's behavioral equations. The costs of using simple rules relative to the costs of parameter misspecification are also assessed.