In game theory, grim trigger (also called the grim strategy or just grim) is a trigger strategy for a repeated game.
Initially, a player using grim trigger will cooperate, but as soon as the opponent defects (thus satisfying the trigger condition), the player using grim trigger will defect for the remainder of the iterated game. Since a single defect by the opponent triggers defection forever, grim trigger is the most strictly unforgiving of strategies in an iterated game.
In Robert Axelrod's book The Evolution of Cooperation, grim trigger is called "Friedman", for a 1971 paper by James W. Friedman, which uses the concept.[1][2]
^Friedman, James W. (1971). "A Non-cooperative Equilibrium for Supergames". Review of Economic Studies. 38 (1): 1–12. doi:10.2307/2296617. JSTOR 2296617.
theory, grimtrigger (also called the grim strategy or just grim) is a trigger strategy for a repeated game. Initially, a player using grimtrigger will...
Look up Grim, grim, or Grims in Wiktionary, the free dictionary. Grim may refer to: Grim (surname) Myron Grim Natwick (1890–1990), American artist, animator...
from grimtrigger, in that it is forgiving in nature, as it immediately produces cooperation, should the competitor choose to cooperate. Grimtrigger on...
e., the trigger) is observed. The level of punishment and the sensitivity of the trigger vary with different trigger strategies. Grimtrigger (the punishment...
1257/jep.5.1.193. Kaivanto, K.; Kroll, E. B. & Zabinski, M. (2014). "Bias Trigger Manipulation and Task-Form Understanding in Monty Hall" (PDF). Economics...
rival has used an aggressive advertising campaign at least once (see: grimtrigger) (this threat is credible since symmetric use of aggressive advertising...
was also going to college around this time and DJing on the side as GrimTrigger) connected with Thomas after a friend informed him that Thomas had played...
payoff. (In these games, a winning condition for the first player is triggered at a countable stage, so the payoff can be coded as a set of reals.) Relative...
Cape Grim/Kennaook (Tasmania) The Cape Grim massacre was an attack on 10 February 1828 in which a group of Aboriginal Tasmanians gathering food at a beach...
moment past 12pm (a grim reaper would get me first), but I cannot be killed (for grim reaper n to kill me, I must have survived grim reaper n+1, which is...
considerable attention from storylines such as 1987's "Kraven's Last Hunt," 2010's "Grim Hunt", 2015–2019's "The Unbeatable Squirrel Girl's Friend Kraven", and 2019's...
the mutants who lost their power during the "Decimation" storyline. In "Grim Hunt", she is attacked by Ana Kravinoff and her mother Sasha, who kills her...
robbery, strip clubs, demons, traffic collisions, cruelty to animals, and the grim reaper. The titular character Misfortune is voiced by the game's writer,...
the play Grim the Collier of Croydon, reported to have been written as early as 1599: Rob. I'll have thee come, I say. Why tremblest thou? Grim. No sir...
a Mexican cast. Goi declined the offer as he did not want to revisit the grim subject matter. However, he stated that he has theorized making a sequel...
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