The strenght of a little perfection

E. Kalai*, A. Neme

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The paper deals with three related issues. 1. It introduces a measure of partial subgame perfection for equilibria of repeated games. 2. It illustrates that the folk-theorem discontinuity generated by small complexity costs, as exhibited by Abreu and Rubinstein, does not exist in the presence of any level of perfection. 3. It shows that reactive strategy equilibria, such as tit-for-tat, cannot be subgame perfect, even partially so. As a corollary, this shows a need to use full automata rather than exact automata when studying complexity and perfection in repeated games.

Original languageEnglish (US)
Pages (from-to)335-355
Number of pages21
JournalInternational Journal of Game Theory
Issue number4
StatePublished - Dec 1 1992

ASJC Scopus subject areas

  • Statistics and Probability
  • Mathematics (miscellaneous)
  • Social Sciences (miscellaneous)
  • Economics and Econometrics
  • Statistics, Probability and Uncertainty


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