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Market Informational Inefficiency, Risk Aversion and Quantity Grid

  • Décamps, Jean-Paul
  • Lovo, Stefano

In this paper we show that long run market informational inefficiency is perfectly compatible with standard rational sequential trade models. Our inefficiency result is obtained taking into account two features of actual financial markets: tradable quantities belong to a quantity grid and traders and market makers do not have the same degree of risk aversion. The implementation of our model for reasonable values of the parameters suggests that the long term deviations between asset prices and fundamental value are important. We explain the ambiguous role of the quantity grid in exacerbating or mitigating market inefficiency. We show that stock splits can improve the information content of the order flow and consequently increase price volatility.

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Paper provided by Institut d'Économie Industrielle (IDEI), Toulouse in its series IDEI Working Papers with number 177.

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Date of creation: 2003
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Publication status: Published in Journal of Mathematical Economics, vol.�42, n°1, 2006, p.�109-120.
Handle: RePEc:ide:wpaper:626
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  1. Koski, Jennifer Lynch, 1998. "Measurement Effects and the Variance of Returns after Stock Splits and Stock Dividends," Review of Financial Studies, Society for Financial Studies, vol. 11(1), pages 143-62.
  2. Vives Xavier, 1995. "The Speed of Information Revelation in a Financial Market Mechanism," Journal of Economic Theory, Elsevier, vol. 67(1), pages 178-204, October.
  3. Ohlson, James A. & Penman, Stephen H., 1985. "Volatility increases subsequent to stock splits: An empirical aberration," Journal of Financial Economics, Elsevier, vol. 14(2), pages 251-266, June.
  4. Glosten, Lawrence R. & Milgrom, Paul R., 1985. "Bid, ask and transaction prices in a specialist market with heterogeneously informed traders," Journal of Financial Economics, Elsevier, vol. 14(1), pages 71-100, March.
  5. Décamps, Jean-Paul & Lovo, Stefano, 2003. "Risk Aversion and Herd Behavior in Financial Markets," IDEI Working Papers 246, Institut d'Économie Industrielle (IDEI), Toulouse.
  6. Glosten, Lawrence R, 1989. "Insider Trading, Liquidity, and the Role of the Monopolist Specialist," The Journal of Business, University of Chicago Press, vol. 62(2), pages 211-35, April.
  7. Gottlieb, Gary & Kalay, Avner, 1985. " Implications of the Discreteness of Observed Stock Prices," Journal of Finance, American Finance Association, vol. 40(1), pages 135-53, March.
  8. Yakov Amihud & Haim Mendelson & Jun Uno, 1999. "Number of Shareholders and Stock Prices: Evidence from Japan," Journal of Finance, American Finance Association, vol. 54(3), pages 1169-1184, 06.
  9. Cipriani Marco & Guarino Antonio, 2008. "Herd Behavior and Contagion in Financial Markets," The B.E. Journal of Theoretical Economics, De Gruyter, vol. 8(1), pages 1-56, October.
  10. Marco Cipriani & Antonio Guarino, 2005. "Herd Behavior in a Laboratory Financial Market," Experimental 0502002, EconWPA.
  11. Bruno Biais & David Martimort & Jean-Charles Rochet, 2000. "Competing Mechanisms in a Common Value Environment," Econometrica, Econometric Society, vol. 68(4), pages 799-838, July.
  12. Bikhchandani, Sushil & Hirshleifer, David & Welch, Ivo, 1992. "A Theory of Fads, Fashion, Custom, and Cultural Change in Informational Cascades," Journal of Political Economy, University of Chicago Press, vol. 100(5), pages 992-1026, October.
  13. Avery, Christopher & Zemsky, Peter, 1998. "Multidimensional Uncertainty and Herd Behavior in Financial Markets," American Economic Review, American Economic Association, vol. 88(4), pages 724-48, September.
  14. Biais, Bruno & Glosten, Larry & Spatt, Chester S, 2002. "The Microstructure of Stock Markets," CEPR Discussion Papers 3288, C.E.P.R. Discussion Papers.
  15. Lamoureux, Christopher G & Poon, Percy, 1987. " The Market Reaction to Stock Splits," Journal of Finance, American Finance Association, vol. 42(5), pages 1347-70, December.
  16. repec:oup:restud:v:65:y:1998:i:4:p:741-59 is not listed on IDEAS
  17. Diamond, Douglas W. & Verrecchia, Robert E., 1987. "Constraints on short-selling and asset price adjustment to private information," Journal of Financial Economics, Elsevier, vol. 18(2), pages 277-311, June.
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