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To Respond or Not to Respond: Measures of the Output Gap in Theory and in Practice

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  • Guy Segal

    (Bank of Israel)

Abstract

This paper analyzes the implications of responding to either the model-based New Keynesian output gap or to its estimates, and in particular, a Hodrick-Prescott-filtered output gap or a linearly detrended output gap. Responding to these estimates instead of to the “true” unobserved output gap generates longlasting business cycles and lower welfare. Furthermore, correlations between the estimates and the theoretical output gap depend on the stochastic structure of the shocks affecting the economy. In particular, productivity shocks generate a negative such correlation. Hence, the output gap estimates may provide poor guidance to monetary policy.

Suggested Citation

  • Guy Segal, 2017. "To Respond or Not to Respond: Measures of the Output Gap in Theory and in Practice," International Journal of Central Banking, International Journal of Central Banking, vol. 13(2), pages 73-120, June.
    • Handle: RePEc:ijc:ijcjou:y:2017:q:2:a:3
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    References listed on IDEAS

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