Strong altruism can evolve in randomly formed groups.

@article{Fletcher2004StrongAC,
  title={Strong altruism can evolve in randomly formed groups.},
  author={Jeffrey A. Fletcher and Martin Zwick},
  journal={Journal of theoretical biology},
  year={2004},
  volume={228 3},
  pages={303-13}
}
Although the conditions under which altruistic behaviors evolve continue to be vigorously debated, there is general agreement that altruistic traits involving an absolute cost to altruists (strong altruism) cannot evolve when populations are structured with randomly formed groups. This conclusion implies that the evolution of such traits depends upon special environmental conditions or additional organismic capabilities that enable altruists to interact with each other more than would be… CONTINUE READING

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