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Social Learning in a Changing World

  • Giuseppe Moscarin
  • Marco Ottaviani
  • Lones Smith

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. Rustichini, Aldo & Wolinsky, Asher, 1995. "Learning about variable demand in the long run," Journal of Economic Dynamics and Control, Elsevier, vol. 19(5-7), pages 1283-1292.
  2. Banerjee, Abhijit V, 1992. "A Simple Model of Herd Behavior," The Quarterly Journal of Economics, MIT Press, vol. 107(3), pages 797-817, August.
  3. Smith, L. & Sorensen, P., 1996. "Pathological Outcomes of Observational Learning," Economics Papers 115, Economics Group, Nuffield College, University of Oxford.
  4. Keller, Godfrey & Rady, Sven, 1999. "Optimal Experimentation in a Changing Environment," Review of Economic Studies, Wiley Blackwell, vol. 66(3), pages 475-507, July.
  5. Marco Ottaviani & Giuseppe Moscarini & Lones Smith, 1998. "Social learning in a changing world," Economic Theory, Springer, vol. 11(3), pages 657-665.
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