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Simple Model Of Herd Behaviour, A Comment


  • Andrea Morone


In his ‘Simple model of herd behaviour’, Banerjee (1992) shows that – in a sequential game – if the first two players have chosen the same action, all subsequent players will ignore their own information and start a herd, an irreversible one. The points of strength of Banerjee’s model are its simplicity and the robustness of its results. Its weakness is that it is based on three tie-breaking assumptions, which according to Banerjee minimise herding probabilities. In this paper we analyse the role played by the tie-breaking assumptions in reaching the equilibrium. Even if the overall probability of herding does not change dramatically, the results obtained, which differ from Banerjee's are the following: players' strategies are parameter dependent; an incorrect herd could be reversed; a correct herd is irreversible. There are, in addition, some several cases where available information allows players to find out which action is correct, and so an irreversible correct herd starts.

Suggested Citation

  • Andrea Morone, 2008. "Simple Model Of Herd Behaviour, A Comment," EERI Research Paper Series EERI_RP_2008_12, Economics and Econometrics Research Institute (EERI), Brussels.
  • Handle: RePEc:eei:rpaper:eeri_rp_2008_12

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    Cited by:

    1. Hien Tran & Enrico Santarelli & Enrico Zaninotto, 2015. "Efficiency or bounded rationality? Drivers of firm diversification strategies in Vietnam," Journal of Evolutionary Economics, Springer, vol. 25(5), pages 983-1010, November.

    More about this item


    Herd behaviour;

    JEL classification:

    • D8 - Microeconomics - - Information, Knowledge, and Uncertainty

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