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Social Learning in a Changing World

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  • Giuseppe Moscarin
  • Marco Ottaviani
  • Lones Smith

Abstract

In the social learning model of Banerjee [1] and Bikhchandani, Hirshleifer and Welch [2] individuals take actions sequentially after observing the history of actions taken by the predecessors and an informative private signal. If the state of the world is changing stochastically over time during the learning process, only temporary informational cascades situations where socially valuable information is wasted can arise. Furthermore, no cascade ever arises when the environment changes in a su�ciently unpredictable way.

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Paper provided by ESRC Centre on Economics Learning and Social Evolution in its series ELSE working papers with number 010.

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Handle: RePEc:els:esrcls:010

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  1. Aldo Rustichini & Asher Wolinsky, 1992. "Learning about Variable Demand in the Long Run," Discussion Papers 1015, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
  2. Godfrey Keller & Sven Rady, 1997. "Optimal Experimentation in a Changing Environment," STICERD - Theoretical Economics Paper Series /1997/333, Suntory and Toyota International Centres for Economics and Related Disciplines, LSE.
  3. Smith, L, 1996. "Social Learning in a Changing World," Working papers 96-34, Massachusetts Institute of Technology (MIT), Department of Economics.
  4. Smith, L. & Sorensen, P., 1996. "Pathological Outcomes of Observational Learning," Economics Papers 115, Economics Group, Nuffield College, University of Oxford.
  5. 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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