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Can learnability save new-Keynesian models?

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  • Cochrane, John H.

Abstract

McCallum (2009) argues that "learnability" can save new-Keynesian models from indeterminacies. He claims the unique bounded equilibrium is learnable, and the explosive equilibria are not. However, he assumes that agents can directly observe the monetary policy shock. Reversing this assumption, I find the opposite: the bounded equilibrium is not learnable and the unbounded equilibria are learnable. More generally, I argue that a threat by the Fed to move to an "unlearnable" equilibrium for all but one value of inflation is a poor foundation for choosing the bounded equilibrium of a new-Keynesian model.

Suggested Citation

  • Cochrane, John H., 2009. "Can learnability save new-Keynesian models?," Journal of Monetary Economics, Elsevier, vol. 56(8), pages 1109-1113, November.
    • Handle: RePEc:eee:moneco:v:56:y:2009:i:8:p:1109-1113
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    References listed on IDEAS

    as
    1. McCallum, Bennett T., 2009. "Inflation determination with Taylor rules: Is new-Keynesian analysis critically flawed?," Journal of Monetary Economics, Elsevier, vol. 56(8), pages 1101-1108, November.
    2. John H. Cochrane, 2011. "Determinacy and Identification with Taylor Rules," Journal of Political Economy, University of Chicago Press, vol. 119(3), pages 565-615.
    3. Andrew Atkeson & Varadarajan V. Chari & Patrick J. Kehoe, 2010. "Sophisticated Monetary Policies," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 125(1), pages 47-89.
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    More about this item

    Keywords

    New-Keynesian model Learning Learnability Multiple equilibria Indeterminacy;

    JEL classification:

    • E0 - Macroeconomics and Monetary Economics - - General

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