Published online by Cambridge University Press: 31 January 2012
Strong reciprocity theorists claim that punishment has evolved to promote the good of the group and to deter cheating. By contrast, weak reciprocity suggests that punishment aims to restore justice (i.e., reciprocity) between the criminal and his victim. Experimental evidences as well as field observations suggest that humans punish criminals to restore fairness rather than to support group cooperation.
Target article
The restorative logic of punishment: Another argument in favor of weak selection
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Reciprocity: Weak or strong? What punishment experiments do (and do not) demonstrate