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Adaptive learning and multiple equilibria in a natural rate monetary model with unemployment persistence

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  • Anssi Rantala

    (Pellervo Economic Research Institute)

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    Abstract

    This paper demonstrates that the adaptive learning approach to modelling private sector expectations can be used as an equilibriumselection mechanism in a natural-rate monetary model with unemployment persistence. In particular, it is shown that only one of the two rational expectations equilibria is stable under least-squares learning, and that it is always the low-inflation equilibrium with intuitive comparative statics properties that is the learnable equilibrium. Hence, this paper provides a basic theoretical justification for focusing on the low-inflation equilibrium. Earlier contributions, in which the high- inflation equilibrium was ignored, mainly because of its unpleasant characteristics, are not theoretically satisfactory.

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    Bibliographic Info

    Paper provided by EconWPA in its series GE, Growth, Math methods with number 0404005.

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    Date of creation: 27 Apr 2004
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    Handle: RePEc:wpa:wuwpge:0404005

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    Keywords: adaptive learning; monetary policy; multiple equilibria; persistence;

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    8. George W. Evans & Seppo Honkapohja, 2003. "Expectations and the Stability Problem for Optimal Monetary Policies," Review of Economic Studies, Oxford University Press, vol. 70(4), pages 807-824.
    9. George W. Evans & Seppo Honkapohja, 2003. "Adaptive learning and monetary policy design," Proceedings, Federal Reserve Bank of Cleveland, pages 1045-1084.
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    13. Lockwood, Ben, 1997. "State-Contingent Inflation Contracts and Unemployment Persistence," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 29(3), pages 286-99, August.
    14. Barro, Robert J & Gordon, David B, 1983. "A Positive Theory of Monetary Policy in a Natural Rate Model," Journal of Political Economy, University of Chicago Press, vol. 91(4), pages 589-610, August.
    15. Lockwood, Ben & Miller, Marcus & Zhang, Lei, 1998. "Designing Monetary Policy When Unemployment Persists," Economica, London School of Economics and Political Science, vol. 65(259), pages 327-45, August.
    16. Layard, Richard & Nickell, Stephen & Jackman, Richard, 2005. "Unemployment: Macroeconomic Performance and the Labour Market," OUP Catalogue, Oxford University Press, number 9780199279173, September.
    17. William Poole, 2002. "Flation," Speech 49, Federal Reserve Bank of St. Louis.
    18. Henrik Jensen & Roel M. W. J. Beetsma, 1999. "Optimal Inflation Targets, "Conservative" Central Banks, and Linear Inflation Contracts: Comment," American Economic Review, American Economic Association, vol. 89(1), pages 342-347, March.
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