Abstract
For the iterated Prisoner's Dilemma there exist good strategies which solve the problem when we restrict attention to the long-term average payoff. When used by both players, these assure the cooperative payoff for each of them. Neither player can benefit by moving unilaterally to any other strategy, i.e., these provide Nash equilibria. In addition, if a player uses instead an alternative which decreases the opponent's payoff below the cooperative level, then his own payoff is decreased as well. Thus, if we limit attention to the long-term payoff, these strategies effectively stabilize cooperative behavior. The existence of such strategies follows from the so-called Folk Theorem for super games, and the proof constructs an explicit memory-one example, which has been labeled Grim. Here we describe all the memory-one good strategies for the non-symmetric version of the Prisoner's Dilemma. This is the natural object of study when the payoffs are in units of the separate players' utilities. We discuss the special advantages and problems associated with some specific good strategies.
Recommended Citation
E. Akin, "What You Gotta Know to Play Good in the Iterated Prisoner’s Dilemma," Games, vol. 6, no. 3, pp. 175 - 190, MDPI, Jul 2015.
The definitive version is available at https://doi.org/10.3390/g6030175
Department(s)
Mathematics and Statistics
Publication Status
Open Access
Keywords and Phrases
Good strategies; Individual utility; Iterated play; Markov strategies; Prisoner's Dilemma; Stable cooperative behavior
International Standard Serial Number (ISSN)
2073-4336
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2026 The Authors, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution 4.0 License.
Publication Date
21 Jul 2015
