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The Phillips Curve and Optimal Policy in a Structural Signal Extraction Model


  • Jean-Pascal Benassy



We study a monetary economy subject to "signal extraction" problems, and investigate within that framework the positive and normative aspects of monetary policy. As in Lucas (1972, 1973), imperfect signal perception generates macroeconomic correlations similar to those found in the "Phillips curve" literature. Moving to normative aspects, we find that, when aggregate shocks are present, traditional nonactivist policies do not allow to reach the first best, and that an intelligent activist policy always leads to better outcomes. The specific characteristics and effectiveness of this optimal policy also depend crucially on the problem of signal extraction. (Copyright: Elsevier)

Suggested Citation

  • Jean-Pascal Benassy, 2001. "The Phillips Curve and Optimal Policy in a Structural Signal Extraction Model," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 4(1), pages 58-74, January.
  • Handle: RePEc:red:issued:v:4:y:2001:i:1:p:58-74
    DOI: 10.1006/redy.2000.0103

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    References listed on IDEAS

    1. Sargent, Thomas J & Wallace, Neil, 1982. "The Real-Bills Doctrine versus the Quantity Theory: A Reconsideration," Journal of Political Economy, University of Chicago Press, vol. 90(6), pages 1212-1236, December.
    2. Lucas, Robert E, Jr, 1973. "Some International Evidence on Output-Inflation Tradeoffs," American Economic Review, American Economic Association, vol. 63(3), pages 326-334, June.
    3. Polemarchakis, H. M. & Weiss, L., 1977. "On the desirability of a "totally random" monetary policy," Journal of Economic Theory, Elsevier, vol. 15(2), pages 345-350, August.
    4. Bulow, J & Polemarchakis, H M, 1983. "Retroactive Money," Economica, London School of Economics and Political Science, vol. 50(199), pages 301-310, August.
    5. Lucas, Robert Jr., 1972. "Expectations and the neutrality of money," Journal of Economic Theory, Elsevier, vol. 4(2), pages 103-124, April.
    6. Paul A. Samuelson, 1958. "An Exact Consumption-Loan Model of Interest with or without the Social Contrivance of Money," Journal of Political Economy, University of Chicago Press, vol. 66, pages 467-467.
    7. Sargent, Thomas J & Wallace, Neil, 1975. ""Rational" Expectations, the Optimal Monetary Instrument, and the Optimal Money Supply Rule," Journal of Political Economy, University of Chicago Press, vol. 83(2), pages 241-254, April.
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    Cited by:

    1. Lungu, L. & Matthews, K.G.P. & Minford, A.P.L., 2008. "Partial current information and signal extraction in a rational expectations macroeconomic model: A computational solution," Economic Modelling, Elsevier, vol. 25(2), pages 255-273, March.

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    JEL classification:

    • E5 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit


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