In his 'Simple model of herd behaviour', (Banerjee A (1992) A simple model of herd behaviour. Q J Econ CVII: 797-817) shows that-in a sequential game-if the first two players have chosen the same action, player 3 and all subsequent players will ignore his/her own information and start a herd, an irreversible one. In this paper, we analyse the role played by the tie-breaking assumptions in reaching the equilibrium. We show that: players' strategies are parameter dependent-an incorrect herd may be reversed; a correct herd is irreversible.
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