Exit rights open complex pathways to cooperation. Issue 174 (13th January 2021)

• Record Type: Journal Article
• Authors: Shen, Chen; Jusup, Marko; Shi, Lei; Wang, Zhen; Perc, Matjaž; Holme, Petter
• Is Part Of: Journal of the Royal Society interface. Volume 18:Issue 174(2021)
• Publication Date: 2021-01-13
• Subjects: evolutionary game theory -- cooperation -- coexistence -- cyclic dominance -- oscillations; Physical sciences -- Research -- Periodicals; Life sciences -- Research -- Periodicals; Interdisciplinary research -- Periodicals; 570.5
• DOI: 10.1098/rsif.2020.0777
• Languages: English
• ISSNs: 1742-5689

Abstract

Abstract : We study the evolutionary dynamics of the Prisoner's Dilemma game in which cooperators and defectors interact with another actor type called exiters. Rather than being exploited by defectors, exiters exit the game in favour of a small pay-off. We find that this simple extension of the game allows cooperation to flourish in well-mixed populations when iterations or reputation are added. In networked populations, however, the exit option is less conducive to cooperation. Instead, it enables the coexistence of cooperators, defectors, and exiters through cyclic dominance. Other outcomes are also possible as the exit pay-off increases or the network structure changes, including network-wide oscillations in actor abundances that may cause the extinction of exiters and the domination of defectors, although game parameters should favour exiting. The complex dynamics that emerges in the wake of a simple option to exit the game implies that nuances matter even if our analyses are restricted to incentives for rational behaviour.