Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524

Article

CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE
AND TECHNOLOGY

Published online September 30, 2024     https://doi.org/10.1007/s40042-024-01135-2

Copyright © The Korean Physical Society.

Initial image-based approach may enhance direct reciprocity for cooperation evolution

Sunhee Chae, Hyeong‑Chai Jeong

J. Korean Phys. Soc. 85(6), 525 - 533 (2024)

Abstract

We explore the evolution of strategies in the iterated Prisoner’s Dilemma within finite populations, where players repeatedly interact with the same partners and have access to public records of others' actions. We analyze a variety of discriminating strategies that utilize both direct reciprocity (based on repeated interactions) and indirect reciprocity (based on public information), along with strategies of always cooperating or always defecting. Our results show that a strategy combining tit-for-tat for repeated encounters and indirect information for initial interactions is generally the most effective, except when the benefits greatly outweigh the costs, where the standard tit-for-tat strategy prevails.

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