Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22414
Title: Diversity of timescale promotes the maintenance of extortioners in a spatial prisoner's dilemma game
Authors: Rong, Z
Wu, ZX
Hao, D
Chen, MZQ
Zhou, T
Keywords: Coevolution
Cooperation
Time scale
Issue Date: 2015
Publisher: Institute of Physics Publishing
Source: New journal of physics, 2015, v. 17, 33032, p. 1-12 How to cite?
Journal: New Journal of Physics 
Abstract: Recently, a class of interesting strategies, named extortion strategies, has attracted considerable attention since such extortion strategies can dominate any opponent in a repeated prisoner's dilemma game. In this paper, we investigate the influence of the strategy-selection timescale on the evolution of extortion and cooperation in networked systems. Through connecting the lifetime of individuals' strategies with their fitness, we find that extortioners can form long-term stable relationships with cooperative neighbors, whereas the lifetime of a defection strategy is short according to the myopic best response rule. With the separation of interaction and strategy-updating timescales, the extortioners in a square lattice are able to form stable, cross-like structures with cooperators due to the snowdrift-like relation. In scale-free networks the hubs are most likely occupied by extortioners, who furthermore induce their low-degree neighbors to behave as cooperators. Since extortioners in scalefree networks can meet more cooperators than their counterparts in the square lattice, the latter results in higher average fitness of the whole population than the former. The extortioners play the role of a catalyst for the evolution of cooperation, and the diversity of strategy-selection timescale furthermore promotes the maintenance of extortioners with cooperators in networked systems.
URI: http://hdl.handle.net/10397/22414
ISSN: 1367-2630
DOI: 10.1088/1367-2630/17/3/033032
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