Towards effective payoffs in the prisoner’s dilemma game on scale-free networks

Attila Szolnoki, Matjaž Perc and Zsuzsa Danku

Physica A: Statistical Mechanics and its Applications, 2008, vol. 387, issue 8, 2075-2082

Abstract: We study the transition towards effective payoffs in the prisoner’s dilemma game on scale-free networks by introducing a normalization parameter guiding the system from accumulated payoffs to payoffs normalized with the connectivity of each agent. We show that during this transition the heterogeneity-based ability of scale-free networks to facilitate cooperative behavior deteriorates continuously, eventually collapsing with the results obtained on regular graphs. The strategy donations and adaptation probabilities of agents with different connectivities are studied. Results reveal that strategies generally spread from agents with larger towards agents with smaller degree. However, this strategy adoption flow reverses sharply in the fully normalized payoff limit. Surprisingly, cooperators occupy the hubs even if the averaged cooperation level due to partly normalized payoffs is moderate.

Keywords: Evolutionary game theory; Prisoner’s dilemma; Scale-free networks (search for similar items in EconPapers)
Date: 2008
References: View complete reference list from CitEc
Citations: View citations in EconPapers (73)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:387:y:2008:i:8:p:2075-2082

DOI: 10.1016/j.physa.2007.11.021

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