Evolution of indirect reciprocity

@article{Nowak2005EvolutionOI,
  title={Evolution of indirect reciprocity},
  author={Martin A. Nowak and Karl Sigmund},
  journal={Nature},
  year={2005},
  volume={437},
  pages={1291-1298}
}
Natural selection is conventionally assumed to favour the strong and selfish who maximize their own resources at the expense of others. But many biological systems, and especially human societies, are organized around altruistic, cooperative interactions. How can natural selection promote unselfish behaviour? Various mechanisms have been proposed, and a rich analysis of indirect reciprocity has recently emerged: I help you and somebody else helps me. The evolution of cooperation by indirect… 

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