"...The social brain hypothesis refers to the fact that primates have unusually large brains compared to other animals and that these enhanced cognitive capacities are related to the fact that they have a more complex social life. At the core of this lie the concepts of trust and obligations, while enable individuals to co-operate in groups to solve the problems of survival and successful reproduction in more efficient ways. However any such system is inevitably plagued by free-riders (those who take the benefits of co-operating, but fail to pay all the costs) and mechanisms are needed to keep them under control, in order to avoid the delicate balance in relationships in co-operative social systems from being destroyed."
in "Evolutionary Psychology. Dunbar R, Barrett L and Lycett J.
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