Evolution of direct reciprocity under uncertainty can explain human generosity in one-shot encounters.

@article{Delton2011EvolutionOD,
  title={Evolution of direct reciprocity under uncertainty can explain human generosity in one-shot encounters.},
  author={Andrew W. Delton and Max M. Krasnow and Leda Cosmides and John Tooby},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2011},
  volume={108 32},
  pages={13335-40}
}
Are humans too generous? The discovery that subjects choose to incur costs to allocate benefits to others in anonymous, one-shot economic games has posed an unsolved challenge to models of economic and evolutionary rationality. Using agent-based simulations, we show that such generosity is the necessary byproduct of selection on decision systems for regulating dyadic reciprocity under conditions of uncertainty. In deciding whether to engage in dyadic reciprocity, these systems must balance (i… CONTINUE READING
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