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The Existence of Subgame-Perfect Equilibrium in Continuous Games with Almost Perfect Information: A Case for Public Randomization

Christopher Harris, Philip Reny and Arthur Robson
Econometrica
Vol. 63, No. 3 (May, 1995), pp. 507-544
Published by: The Econometric Society
DOI: 10.2307/2171906
Stable URL: http://www.jstor.org/stable/2171906
Page Count: 38
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The Existence of Subgame-Perfect Equilibrium in Continuous Games with Almost Perfect Information: A Case for Public Randomization
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Abstract

The starting point of this paper is a simple, regular dynamic game in which subgame-perfect equilibrium fails to exist. Examination of this example shows that existence would be restored if players were allowed to observe the output of a public-randomization device. The main result of the paper shows that the introduction of public randomization yields existence not only in the example, but also in a large class of dynamic games. It is also argued that the introduction of public randomization is the minimal robust extension of subgame-perfect equilibrium in this class of games.

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