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Herd on the Street: Informational Inefficiencies in a Market with Short-Term Speculation

  • Kenneth A. Froot
  • David S. Scharfstein
  • Jeremy C. Stein

Standard models of informed speculation suggest that traders try to learn information that others do not have. This result implicitly relies on the assumption that speculators have long horizons, i.e, can hold the asset forever. By contrast, we show that if speculators have short horizons, they may herd on the same information, trying to learn what other informed traders also know. There can be multiple herding equilibria, and herding speculators may even choose to study information that is completely unrelated to fundamentals. These equilibria are informationally inefficient.

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File URL: http://www.nber.org/papers/w3250.pdf
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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 3250.

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Date of creation: Feb 1990
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Publication status: published as Journal of Finance, Vol. 47, pp. 1461-84 September 1992
Handle: RePEc:nbr:nberwo:3250
Note: ITI ME IFM
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  1. 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.
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  8. Kyle, Albert S, 1985. "Continuous Auctions and Insider Trading," Econometrica, Econometric Society, vol. 53(6), pages 1315-35, November.
  9. Scharfstein, David. & Stein, Jeremy C., 1988. "Herd behavior and investment," Working papers WP 2062-88., Massachusetts Institute of Technology (MIT), Sloan School of Management.
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  11. Cooper, Russell & John, Andrew, 1988. "Coordinating Coordination Failures in Keynesian Models," The Quarterly Journal of Economics, MIT Press, vol. 103(3), pages 441-63, August.
  12. Shleifer, Andrei & Vishny, Robert W, 1990. "Equilibrium Short Horizons of Investors and Firms," American Economic Review, American Economic Association, vol. 80(2), pages 148-53, May.
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  18. Katz, Michael L & Shapiro, Carl, 1985. "Network Externalities, Competition, and Compatibility," American Economic Review, American Economic Association, vol. 75(3), pages 424-40, June.
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