2011/01/26 by Luo-Luo Jiang, Matjaz Perc, Wen-Xu Wang +2
Physics and Astronomy · Computer Science · Biochemistry, Genetics and Molecular Biology · #physics.soc-ph #cs.SI #q-bio.PE
paper · pdf · doi:10.1209/0295-5075/93/40001
published as EPL 93 (2011) 40001 · 6 two-column pages, 5 figures; accepted for publication in Europhysics Letters [related work available at http://arxiv.org/abs/0902.4661 and http://www.matjazperc.com/]
arxiv created 2011/01/26 · arxiv updated 2011/02/23
Working together in groups may be beneficial if compared to isolated efforts. Yet this is true only if all group members contribute to the success. If not, group efforts may act detrimentally on the fitness of their members. Here we study the evolution of cooperation in public goods games on scale-free networks that are subject to deletion of links that are connected to the highest-degree individuals, i.e., on networks that are under attack. We focus on the case where all groups a player belongs to are considered for the determination of payoffs; the so-called multi-group public goods games. We find that the effect of link deletions on the evolution of cooperation is predominantly detrimental, although there exist regions of the multiplication factor where the existence of an "optimal" number of removed links for deterioration of cooperation can also be demonstrated. The findings are explained by means of wealth distributions and analytical approximations, confirming that socially diverse states are crucial for the successful evolution of cooperation.