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Informational Externalities, Herding and Incentives

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  • Bru, Lluís
  • Vives, Xavier

Abstract

A version of the herding prediction model with a rational expectations flavor is reexamined in the light of incentive theory. The welfare loss at the market solution with respect to the incentive efficient solution can be decomposed into an information externality term minus an incentive cost term. It is found that the inefficiency of herding at the market solution is low when the cost of providing incentives is high. When the cost of providing incentives is low (and this happens when prior information is diffuse) the incentive efficient solution approaches the team solution that fully internalizes the information externality. Then the herding problem at the market solution is at its worst.

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Bibliographic Info

Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 3080.

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Date of creation: Nov 2001
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Handle: RePEc:cpr:ceprdp:3080

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Keywords: coordination; information aggregation; mechanism design; rational expectations; teams;

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References

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  1. Vives, Xavier, 1996. "Social learning and rational expectations," European Economic Review, Elsevier, vol. 40(3-5), pages 589-601, April.
  2. 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.
  3. Sheffrin,Steven M., 1996. "Rational Expectations," Cambridge Books, Cambridge University Press, number 9780521474009, April.
  4. Vives, X., 1990. "How Fast Do Rational Agents Learn?," UFAE and IAE Working Papers 135-90, Unitat de Fonaments de l'Anàlisi Econòmica (UAB) and Institut d'Anàlisi Econòmica (CSIC).
  5. Lones Smith & Peter Sorensen, 2000. "Pathological Outcomes of Observational Learning," Econometrica, Econometric Society, vol. 68(2), pages 371-398, March.
  6. Gul, Faruk & Lundholm, Russell, 1995. "Endogenous Timing and the Clustering of Agents' Decisions," Journal of Political Economy, University of Chicago Press, vol. 103(5), pages 1039-66, October.
  7. Gale, Douglas, 1996. "What have we learned from social learning?," European Economic Review, Elsevier, vol. 40(3-5), pages 617-628, April.
  8. Laffont, Jean-Jacques M, 1985. "On the Welfare Analysis of Rational Expectations Equilibria with Asymmetric Information," Econometrica, Econometric Society, vol. 53(1), pages 1-29, January.
  9. Vives, X., 1993. "Learning from Others," UFAE and IAE Working Papers 206.93, Unitat de Fonaments de l'Anàlisi Econòmica (UAB) and Institut d'Anàlisi Econòmica (CSIC).
  10. Banerjee, Abhijit V, 1992. "A Simple Model of Herd Behavior," The Quarterly Journal of Economics, MIT Press, vol. 107(3), pages 797-817, August.
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Citations

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Cited by:
  1. Itay Goldstein & Emre Ozdenoren & Kathy Yuan, 2011. "Trading Frenzies and their Impact on Real Investment," FMG Discussion Papers dp670, Financial Markets Group.
  2. Kathy Yuan & Emre Ozdenoren & Itay Goldstein, 2008. "Learning and Complementarities: Implications for Speculative Attacks," 2008 Meeting Papers 276, Society for Economic Dynamics.
  3. Christoph Engel, 2004. "Social Dilemmas, Revisited from a Heuristics Perspective," Working Paper Series of the Max Planck Institute for Research on Collective Goods 2004_4, Max Planck Institute for Research on Collective Goods.
  4. Rodriguez Mora, Jose V. & Schulstad, Paul, 2007. "The effect of GNP announcements on fluctuations of GNP growth," European Economic Review, Elsevier, vol. 51(8), pages 1922-1940, November.

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