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Donors to charity gain in both indirect reciprocity and political reputation

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons56825

Milinski,  Manfred
Department Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons56933

Semmann,  Dirk
Department Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons56779

Krambeck,  Hans-Jürgen
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Milinski, M., Semmann, D., & Krambeck, H.-J. (2002). Donors to charity gain in both indirect reciprocity and political reputation. Proceedings of the Royal Society of London Series B-Biological Sciences, 269(1494), 881-883. doi:10.1098/rspb.2002.1964.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-DD42-D
Abstract
Darwinian evolution can explain human cooperative behaviour among non-kin by either direct or indirect reciprocity. In the latter case one does not expect a return for an altruistic act from the recipient as with direct reciprocity, but from another member of the social group. However, the widespread human behaviour of donating to poor people outside the social group, for example, to charity organizations, that are unlikely to reciprocate indirectly and thus are equivalent to defectors in the game is still an evolutionary puzzle. Here we show experimentally that donations made in public to a well-known relief organization resulted both in increased income (that the donors received from the members of their group) and in enhanced political reputation (they were elected to represent the interests of their group). Donations may thus function as an honest signal for one''s social reliability.