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Overconfidence and Market Efficiency with Heterogeneous Agents

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Author Info
Diego Garcia
Francesco Sangiorgi
Branko Urosevic

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Abstract

We study financial markets in which both rational and overconfident agents coexist and make endogenous information acquisition decisions. We demonstrate the following irrele- vance result: when a positive fraction of rational agents (endogenously) decides to become informed in equilibrium, prices are set as if all investors were rational, and as a conse- quence the overconfidence bias does not affect informational efficiency, price volatility, ra- tional traders expected profits or their welfare. Intuitively, as overconfidence goes up, so does price informativeness, which makes rational agents cut their information acquisition activities, effectively undoing the standard effect of more aggressive trading by the overcon- fident. The main intuition of the paper, if not the irrelevance result, is shown to be robust to different model specifications.

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Publisher Info
Paper provided by Collegio Carlo Alberto in its series Carlo Alberto Notebooks with number 11.

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Length: 32 pages
Date of creation: 2005
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Publication status: Forthcoming in Economic Theory
Handle: RePEc:cca:wpaper:11

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Related research
Keywords: partially revealing equilibria; overconfidence; rational expectations; information acquisition; price informativeness.;

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Find related papers by JEL classification:
D80 - Microeconomics - - Information, Knowledge, and Uncertainty - - - General
G10 - Financial Economics - - General Financial Markets - - - General (includes Measurement and Data)

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References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
  1. Glaser, Markus & Weber, Martin, 2003. "Overconfidence and Trading Volume," Sonderforschungsbereich 504 Publications 03-07, Sonderforschungsbereich 504, Universität Mannheim & Sonderforschungsbereich 504, University of Mannheim. [Downloadable!]
  2. Antonio E. Bernardo & Ivo Welch, 2001. "On the Evolution of Overconfidence and Entrepreneurs," Cowles Foundation Discussion Papers 1307, Cowles Foundation, Yale University. [Downloadable!]
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  3. Shleifer, Andrei & Vishny, Robert W, 1997. " The Limits of Arbitrage," Journal of Finance, American Finance Association, vol. 52(1), pages 35-55, March. [Downloadable!] (restricted)
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  4. Alan D. Morrison, 2004. "Competition and Information Production in Market Maker Models," Journal of Business Finance & Accounting, Blackwell Publishing, vol. 31(7-8), pages 1171-1190. [Downloadable!] (restricted)
  5. 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. [Downloadable!] (restricted)
  6. De Long, J Bradford & Andrei Shleifer & Lawrence H. Summers & Robert J. Waldmann, 1990. "Noise Trader Risk in Financial Markets," Journal of Political Economy, University of Chicago Press, vol. 98(4), pages 703-38, August. [Downloadable!] (restricted)
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  7. Gervais, Simon & Odean, Terrance, 2001. "Learning to be Overconfident," Review of Financial Studies, Oxford University Press for Society for Financial Studies, vol. 14(1), pages 1-27.
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  8. Verrecchia, Robert E, 1982. "Information Acquisition in a Noisy Rational Expectations Economy," Econometrica, Econometric Society, vol. 50(6), pages 1415-30, November. [Downloadable!] (restricted)
  9. Admati, Anat R. & Pfleiderer, Paul, 1987. "Viable allocations of information in financial markets," Journal of Economic Theory, Elsevier, vol. 43(1), pages 76-115, October. [Downloadable!] (restricted)
  10. J. Bradford De Long & Andrei Shleifer & Lawrence H. Summers & Robert J. Waldmann,, . "The Survival of Noise Traders in Financial Markets," J. Bradford De Long's Working Papers _123, University of California at Berkeley, Economics Department. [Downloadable!]
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  11. Diamond, Douglas W, 1985. " Optimal Release of Information by Firms," Journal of Finance, American Finance Association, vol. 40(4), pages 1071-94, September. [Downloadable!] (restricted)
  12. Admati, Anat R. & Pfleiderer, Paul, 1986. "A monopolistic market for information," Journal of Economic Theory, Elsevier, vol. 39(2), pages 400-438, August. [Downloadable!] (restricted)
  13. Glaser, Markus & Weber, Martin, 2003. "Overconfidence and Trading Volume," CEPR Discussion Papers 3941, C.E.P.R. Discussion Papers. [Downloadable!] (restricted)
  14. Gadi Barlevy & Pietro Veronesi, . "Information Acquisition in Financial Markets," CRSP working papers 484, Center for Research in Security Prices, Graduate School of Business, University of Chicago.
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  15. Kyle, Albert S, 1985. "Continuous Auctions and Insider Trading," Econometrica, Econometric Society, vol. 53(6), pages 1315-35, November. [Downloadable!] (restricted)
  16. Grossman, Sanford J & Stiglitz, Joseph E, 1980. "On the Impossibility of Informationally Efficient Markets," American Economic Review, American Economic Association, vol. 70(3), pages 393-408, June.
  17. Hirshleifer, David & Luo, Guo Ying, 2001. "On the survival of overconfident traders in a competitive securities market," Journal of Financial Markets, Elsevier, vol. 4(1), pages 73-84, January. [Downloadable!] (restricted)
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  18. KENT D. DANIEL & David Hirshleifer & AVANIDHAR SUBRAHMANYAM, 2004. "A Theory of Overconfidence, Self-Attribution, and Security Market Under- and Over-reactions," Finance 0412006, EconWPA. [Downloadable!]
  19. Brad M. Barber & Terrance Odean, 2001. "Boys Will Be Boys: Gender, Overconfidence, And Common Stock Investment," The Quarterly Journal of Economics, MIT Press, vol. 116(1), pages 261-292, February. [Downloadable!] (restricted)
  20. Benos, Alexandros V., 1998. "Aggressiveness and survival of overconfident traders," Journal of Financial Markets, Elsevier, vol. 1(3-4), pages 353-383, September. [Downloadable!] (restricted)
  21. Hellwig, Martin F., 1980. "On the aggregation of information in competitive markets," Journal of Economic Theory, Elsevier, vol. 22(3), pages 477-498, June. [Downloadable!] (restricted)
Full references

Cited by:
(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Menno Middeldorp & Stephanie Rosenkranz, 2008. "Information acquisition in an experimental asset market," Working Papers 08-25, Utrecht School of Economics. [Downloadable!]
  2. Benoît, Jean-Pierre & Dubra, Juan, 2008. "Overconfidence?," MPRA Paper 8879, University Library of Munich, Germany. [Downloadable!]
    Other versions:
  3. Elisa Luciano & Elena Vigna, 2006. "Non mean reverting affne processes for stochastic mortality," Carlo Alberto Notebooks 30, Collegio Carlo Alberto. [Downloadable!]
    Other versions:
  4. 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. [Downloadable!]
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