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Model Uncertainty and Endogenous Volatility

  • Wiliam Branch

    (University of Californis - Irvine)

  • George W. Evans

    ()

    (University of Oregon Economics Department)

This paper identifies two channels through which the economy can generate endogenous inflation and output volatility, an empirical regularity, by introducing model uncertainty into a Lucas-type monetary model. The equilibrium path of inflation depends on agents' expectations and a vector of exogenous random variables. Following Branch and Evans (2004) agents are assumed to underparameterize their forecasting models. A Misspecification Equilibrium arises when beliefs are optimal given the misspecification and predictor proportions based on relative forecast performance. We show that there may exist multiple Misspecification Equilibria, a subset of which are stable under least squares learning and dynamic predictor selection. The dual channels of least squares parameter updating and dynamic predictor selection combine to generate regime switching and endogenous volatility.

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Paper provided by University of Oregon Economics Department in its series University of Oregon Economics Department Working Papers with number 2005-21.

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Length: 41
Date of creation: 18 Oct 2005
Date of revision: 26 Oct 2006
Handle: RePEc:ore:uoecwp:2005-21
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  1. Thomas J. Sargent & Noah William, 2005. "Impacts of Priors on Convergence and Escapes from Nash Inflation," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 8(2), pages 360-391, April.
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  4. William A. Branch & John Carlson & George W. Evans & Bruce McGough, 2004. "Monetary policy, endogenous inattention, and the volatility trade-off," Working Paper 0411, Federal Reserve Bank of Cleveland.
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  14. Guse, Eran A., 2005. "Stability properties for learning with heterogeneous expectations and multiple equilibria," Journal of Economic Dynamics and Control, Elsevier, vol. 29(10), pages 1623-1642, October.
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  28. William Poole, 2002. "Flation," Speech 49, Federal Reserve Bank of St. Louis.
  29. In-Koo Cho & Kenneth Kasa, 2003. "Learning Dynamics and Endogenous Currency Crises," Computing in Economics and Finance 2003 132, Society for Computational Economics.
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