Rational overconfidence and excess volatility in General Equilibrium
Rational beliefs (in the form of WAMS measures) are expectations which though consistent with empirical observations, may deviate from the true underlying probability measure under which data is generated.We provide results on, as well as a decomposition of, WAMS measures and use this to demonstrate that an agent that adopts a non-stationary rational belief is rationally overconfident.To apply the theory to models of general equilibrium, we introduce the concept of a sunspot rational beliefs structure which can be considered as the exogenously specified part of a state process with rational beliefs. As an application, we consider an continuous state space model where agents make production decision before knowing prices. Under rational beliefs, unlike under rational expectations, mistakes persist even though all agents make forecasts that are statistically consistent with the equilibrium process. Due to the correlation of subjective beliefs brought about by the sunspots, the equilibrium exhibits excess price volatility.
|Date of creation:||11 Aug 2004|
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- Hammond, Peter J, 1981. "Ex-ante and Ex-post Welfare Optimality under Uncertainty," Economica, London School of Economics and Political Science, vol. 48(191), pages 235-250, August.
- Jose A. Scheinkman & Wei Xiong, 2003. "Overconfidence and Speculative Bubbles," Journal of Political Economy, University of Chicago Press, vol. 111(6), pages 1183-1219, December.
- Carsten Krabbe Nielsen, 2003.
"Floating exchange rates versus a monetary union under rational beliefs: the role of endogenous uncertainty,"
Springer;Society for the Advancement of Economic Theory (SAET), vol. 21(2), pages 293-315, 03.
- Carsten Krabbe Nielsen, 1997. "Floating Exchange Rates Versus a Monetary Union Under Rational Beliefs: The Role of Endogenous Uncertainty," Discussion Papers 97-22, University of Copenhagen. Department of Economics.
- Mordecai Kurz & Maurizio Motolese, "undated". "Endogenous Uncertainty and Market Volatility," Working Papers 99005, Stanford University, Department of Economics.
- Mordecai Kurz & Maurizio Motolese, 1999. "Endogenous Uncertainty and Market Volatility," Working Papers 1999.27, Fondazione Eni Enrico Mattei.
- Ho-Mou Wu & Wen-Chung Guo, 2003. "Speculative trading with rational beliefs and endogenous uncertainty," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 21(2), pages 263-292, 03.
- Guidolin, Massimo & Timmermann, Allan, 2003. "Option prices under Bayesian learning: implied volatility dynamics and predictive densities," Journal of Economic Dynamics and Control, Elsevier, vol. 27(5), pages 717-769, March.
- Allan Timmermann & Massimo Guidolin, 2001. "Option Prices under Bayesian Learning: Implied Volatility Dynamics and Predictive Densities," FMG Discussion Papers dp397, Financial Markets Group.
- Guidolin, Massimo & Timmermann, Allan G, 2001. "Option Prices under Bayesian Learning: Implied Volatility Dynamics and Predictive Densities," CEPR Discussion Papers 3005, C.E.P.R. Discussion Papers.
- Cass, David & Shell, Karl, 1983. "Do Sunspots Matter?," Journal of Political Economy, University of Chicago Press, vol. 91(2), pages 193-227, April.
- Mark P. Taylor, 1995. "The Economics of Exchange Rates," Journal of Economic Literature, American Economic Association, vol. 33(1), pages 13-47, March.
- Dan Lovallo & Colin Camerer, 1999. "Overconfidence and Excess Entry: An Experimental Approach," American Economic Review, American Economic Association, vol. 89(1), pages 306-318, March.
- Carsten Krabbe Nielsen, 1996. "Rational belief structures and rational belief equilibria (*)," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 8(3), pages 399-422.
- Carsten Krabbe Nielsen, 1995. "Rational Belief Structures and Rational Belief Equilibrium," Discussion Papers 95-14, University of Copenhagen. Department of Economics.