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Optimal Monetary Policy Inertia

  • Michael Woodford

This paper considers the desirability of the observed tendency of central banks to adjust interest rates only gradually in response to changes in economic conditions. It shows, in the context of a simple model of optimizing private-sector behavior, that such inertial policy can be optimal. The reason is that small but persistent changes in short-term interest rates in response to shocks allow a larger effect of monetary policy on long rates and hence upon aggregate demand, for a given degree of overall interest-rate variability. The paper also considers two ways of achieving the desirable degree of inertia in the equilibrium responses to shocks. One is by assignment of a loss function that penalizes squared interest-rate changes (despite the fact that interest-rate changes do not affect the true social objective) to a central bank that is then expected to use discretion in the pursuit of the goal. The second is through commitment to an explicit instrument rule, a generalization of the Taylor rule' in which the funds rate is an increasing function of the lagged funds rate, as in estimated Fed reaction functions.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 7261.

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Date of creation: Jul 1999
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Publication status: published as The Manchester School, Vol. 67, Supplement S1 (1999): 1-35
Handle: RePEc:nbr:nberwo:7261
Note: EFG ME
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