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Overconfidence and market efficiency with heterogeneous agents

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  • Diego Garcia
  • Francesco Sangiorgi
  • Branko Urosevic

Abstract

We study financial markets in which both rational and overconfident agents coexist and make endogenous information acquisition decisions. We demonstrate the following irrelevance result: when a positive fraction of rational agents (endogeneously) decides to become informed in equilibrium, prices are set as if all investors were rational, and as a consequence the overconfidence bias does not a ect informational efficiency, price volatility, rational traders’ expected profits or their welfare. Intuitively, as overconfidence goes up, so does price infornativeness, which makes rational agents cut their information acquisition activities, effectively undoing the standard effect of more aggressive trading by the overconfident.

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Bibliographic Info

Paper provided by Department of Economics and Business, Universitat Pompeu Fabra in its series Economics Working Papers with number 786.

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Date of creation: Oct 2004
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Handle: RePEc:upf:upfgen:786

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Web page: http://www.econ.upf.edu/

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Keywords: Partially revealing equilibria; overconfidence; rational expectations; information;

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Cited by:
  1. Rietveld, C.A. & Groenen, P.J.F. & Koellinger, Ph.D. & van der Loos, M.J.H.M. & Thurik, A.R., 2013. "Living Forever: Entrepreneurial Overconfidence at Older Ages," ERIM Report Series Research in Management ERS-2013-012-STR, Erasmus Research Institute of Management (ERIM), ERIM is the joint research institute of the Rotterdam School of Management, Erasmus University and the Erasmus School of Economics (ESE) at Erasmus Uni.
  2. Jean Pierre Benoit & Juan Dubra, 2008. "Overconfidence?," Levine's Working Paper Archive 122247000000002142, David K. Levine.
  3. Benoît, Jean-Pierre & Dubra, Juan & Moore, Don, 2009. "Does the Better-Than-Average Effect Show That People Are Overconfident?: An Experiment," MPRA Paper 13168, University Library of Munich, Germany.
  4. Jean‐Pierre Benoît & Juan Dubra, 2011. "Apparent Overconfidence," Econometrica, Econometric Society, vol. 79(5), pages 1591-1625, 09.
  5. M. Middeldorp & S. Rosenkranz, 2008. "Information acquisition in an experimental asset market," Working Papers 08-25, Utrecht School of Economics.
  6. Zhou, Deqing, 2013. "Irrational confidence, imperfect and long-lived information," International Review of Economics & Finance, Elsevier, vol. 27(C), pages 383-405.
  7. Benoît, Jean-Pierre & Dubra, Juan & Moore, Don, 2009. "Does the Better-Than-Average Effect Show That People Are Overconfident?: Two Experiments," MPRA Paper 44956, University Library of Munich, Germany, revised 11 Mar 2013.
  8. Luca Rigotti & Matthew Ryan & Rhema Vaithianathan, 2011. "Optimism and firm formation," Economic Theory, Springer, vol. 46(1), pages 1-38, January.
  9. Bertrand BLANCHETON (GREThA UMR CNRS 5113) & Yves JEGOUREL (LAREFI), 2009. "Sovereign wealth funds: toward a new state capitalism? (In French)," Cahiers du GREThA 2009-04, Groupe de Recherche en Economie Théorique et Appliquée.

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