Selective altruism in collective games

Everyday we experience several examples of altruistic behavior in the worldaround us, at different levels of complexity. But, from the point of view of Darwinian evolution, it seems diffcult to understand why such behaviors can exist and stabilize. Kin selection and inclusive fitness are a first possible explanation of these phenomenons, even if restricted to forms of altruism toward close relatives, which are advantageous since they result to increase the individual’s genetic contribution to the next generation.