IDEAS home Printed from
   My bibliography  Save this paper

Complementarities in Information Acquisition with Short-Term Trades


  • Christophe Chamley

    () (Institute for Economic Development, Boston University)


In a financial market where agents trade for prices in the short-term and where news can increase the uncertainty of the public belief, there are strategic complementarities in the acquisition of private information and a continuum of equilibrium strategies if the cost of information is sufficient small. Imperfect observation of the past prices reduces the continuum of Nash-equilibrium to a unique one which may be a Strongly Rational-Expectations Equilibrium. In that equilibrium, because of the strategic complementarity, there are two sharply different regimes for the evolution of the price, the volume of trade and the information acquisition which is either nil or at its maximum.

Suggested Citation

  • Christophe Chamley, 2005. "Complementarities in Information Acquisition with Short-Term Trades," Boston University - Department of Economics - The Institute for Economic Development Working Papers Series dp-156, Boston University - Department of Economics.
  • Handle: RePEc:bos:iedwpr:dp-156

    Download full text from publisher

    File URL:
    Download Restriction: no

    References listed on IDEAS

    1. Chamley,Christophe P., 2004. "Rational Herds," Cambridge Books, Cambridge University Press, number 9780521530927, March.
    2. Carlsson, Hans & van Damme, Eric, 1993. "Global Games and Equilibrium Selection," Econometrica, Econometric Society, vol. 61(5), pages 989-1018, September.
    3. Gadi Barlevy & Pietro Veronesi, 2000. "Information Acquisition in Financial Markets," Review of Economic Studies, Oxford University Press, vol. 67(1), pages 79-90.
    4. Maria Grazia Romano, 2007. "Learning, Cascades, and Transaction Costs," Review of Finance, European Finance Association, vol. 11(3), pages 527-560.
    5. Jean-Paul Decamps & Stefano Lovo, 2002. "Risk Aversion and Herd Behavior in Financial Markets," Working Papers hal-00593657, HAL.
    6. 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.
    7. Grossman, Sanford J & Stiglitz, Joseph E, 1976. "Information and Competitive Price Systems," American Economic Review, American Economic Association, vol. 66(2), pages 246-253, May.
    8. Russell Cooper & Andrew John, 1988. "Coordinating Coordination Failures in Keynesian Models," The Quarterly Journal of Economics, Oxford University Press, vol. 103(3), pages 441-463.
    9. Avery, Christopher & Zemsky, Peter, 1998. "Multidimensional Uncertainty and Herd Behavior in Financial Markets," American Economic Review, American Economic Association, vol. 88(4), pages 724-748, September.
    10. Chamley,Christophe P., 2004. "Rational Herds," Cambridge Books, Cambridge University Press, number 9780521824019, March.
    11. David Hirshleifer & Siew Hong Teoh, 2003. "Herd Behaviour and Cascading in Capital Markets: a Review and Synthesis," European Financial Management, European Financial Management Association, vol. 9(1), pages 25-66.
    12. R. Guesnerie, 2002. "Anchoring Economic Predictions in Common Knowledge," Econometrica, Econometric Society, vol. 70(2), pages 439-480, March.
    13. Detemple, Jerome B., 1991. "Further results on asset pricing with incomplete information," Journal of Economic Dynamics and Control, Elsevier, vol. 15(3), pages 425-453, July.
    14. David, Alexander, 1997. "Fluctuating Confidence in Stock Markets: Implications for Returns and Volatility," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 32(04), pages 427-462, December.
    15. Vives, Xavier, 1995. "Short-Term Investment and the Informational Efficiency of the Market," Review of Financial Studies, Society for Financial Studies, vol. 8(1), pages 125-160.
    16. 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.
    17. 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.
    18. Veronesi, Pietro, 1999. "Stock Market Overreaction to Bad News in Good Times: A Rational Expectations Equilibrium Model," Review of Financial Studies, Society for Financial Studies, vol. 12(5), pages 975-1007.
    19. Hau, Harald, 1998. "Competitive Entry and Endogenous Risk in the Foreign Exchange Market," Review of Financial Studies, Society for Financial Studies, vol. 11(4), pages 757-787.
    Full references (including those not matched with items on IDEAS)

    More about this item


    financial markets; short-term; endogenous information; multiple equilibria; social learning; trading frenzies.;

    NEP fields

    This paper has been announced in the following NEP Reports:


    Access and download statistics


    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:bos:iedwpr:dp-156. See general information about how to correct material in RePEc.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Program Coordinator). General contact details of provider: .

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service hosted by the Research Division of the Federal Reserve Bank of St. Louis . RePEc uses bibliographic data supplied by the respective publishers.