We have studied the evolution of cooperation in the framework of evolutionary game theory, using the prisoner's dilemma and the snowdrift game in populations in which players are placed on the vertices and their contacts correspond to the edges of graphs. In contrast with previous results we found that correlations between individuals, generated via growth and preferential attachment rules, provide an entirely new regime where cooperation becomes the dominating strategy for the entire range of parameters of both games.
cooperation, evolutionary game theory, complex networks
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