Evolution & Human Behavior
Volume 28, Issue 3 , Pages 193-198, May 2007

Altruism among kin vs. nonkin: effects of cost of help and reciprocal exchange

Department of Psychology, Neuroscience and Behaviour, McMaster University, Hamilton, Ontario, Canada L8S 4K1

Received 10 May 2006; received in revised form 1 January 2007; accepted 9 January 2007. published online 05 April 2007.

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PII: S1090-5138(07)00003-7

doi:10.1016/j.evolhumbehav.2007.01.002

Evolution & Human Behavior
Volume 28, Issue 3 , Pages 193-198, May 2007

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