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Competitive Markets and Aggregate Information

  • G. Glenn Baigent

    ()

    (Department of Finance, Long Island University)

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    This paper shows that a competitive market structure is identically efficient to a Walrasian rational expectations market when risk-averse agents base trades only on unbiased private signals. Because price reflects the complete set of market information, it is a sufficient statistic. The economic role of competing market makers is thus to aggregate information efficiently.

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    File URL: http://college.holycross.edu/RePEc/eej/Archive/Volume29/V29N4P593_606.pdf
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    Article provided by Eastern Economic Association in its journal Eastern Economic Journal.

    Volume (Year): 29 (2003)
    Issue (Month): 4 (Fall)
    Pages: 593-606

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    Handle: RePEc:eej:eeconj:v:29:y:2003:i:4:p:593-606
    Contact details of provider: Postal: c/o Dr. Alexandre Olbrecht, The Anisfield School of Business 205, Ramapo College, 505 Ramapo Valley Road, Ramapo, New Jersey 07430, USA
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    Web page: http://www.ramapo.edu/eea/journal.html
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    1. Kent Daniel & David Hirshleifer & Avanidhar Subrahmanyam, 1998. "Investor Psychology and Security Market Under- and Overreactions," Journal of Finance, American Finance Association, vol. 53(6), pages 1839-1885, December.
    2. 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.
    3. Fama, Eugene F, 1991. " Efficient Capital Markets: II," Journal of Finance, American Finance Association, vol. 46(5), pages 1575-617, December.
    4. Sanford J Grossman & Joseph E Stiglitz, 1997. "On the Impossibility of Informationally Efficient Markets," Levine's Working Paper Archive 1908, David K. Levine.
    5. Kyle, Albert S, 1985. "Continuous Auctions and Insider Trading," Econometrica, Econometric Society, vol. 53(6), pages 1315-35, November.
    6. Anat R. Admati, Paul Pfleiderer, 1988. "A Theory of Intraday Patterns: Volume and Price Variability," Review of Financial Studies, Society for Financial Studies, vol. 1(1), pages 3-40.
    7. De Bondt, Werner F M & Thaler, Richard, 1985. " Does the Stock Market Overreact?," Journal of Finance, American Finance Association, vol. 40(3), pages 793-805, July.
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