Impact of Delays in Policy Implementation on Economic Stability under Sticky Prices

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This study extends the New Keynesian model to examine the impact of delays in monetary policy implementation on economic stability. The extant literature indicates that if a central bank delays its response to the inflation rate, this policy lag may increase the number of positive roots in the model economy, implying that a time lag associated with inflation-targeting policy causes instability or eliminates indeterminacy. However, cases where a central bank considers multiple target variables but only one of them has a lag have not yet been examined. We analyze the case in which the inflation rate and output are the target variables of policy intervention, wherein a delay occurs in the central bank's response to output. We demonstrate that a policy lag may increase the number of negative roots in the dynamic system, implying that instability rather than indeterminacy may be eliminated by a policy lag.

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