Dictionary

Glossary of game theory terms.

Grim Trigger Strategy

A trigger strategy usually applied to repeated prisoner's dilemmas in which a player begins by cooperating in the first period, and continues to cooperate until a single defection by her opponent, following which, the player defects forever. Grim trigger is a severe trigger strategy since a single defection brings about an eternal end to cooperation, in contrast to the much more forgiving tit for tat.

updated: 15 August 2005
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