Evolutionarily Stable In-Group Favoritism and Out-Group Spite in Intergroup Conflict
22 Pages Posted: 8 Jul 2011 Last revised: 2 Jan 2012
Date Written: July 2011
We study conflict between two groups of individuals. Using Schaffer's (1988) concept of evolutionary stability we provide an evolutionary underpinning for in-group altruism combined with spiteful behavior towards members of the rival out-group. We characterize the set of evolutionarily stable combinations of in-group favoritism and out-group spite and find that an increase in in-group altruism can be balanced by a decrease in spiteful behavior towards the out-group.
Keywords: altruism, spite, in-group favoritism, conflict, evolutionary stability, indirect evolutionary approach
JEL Classification: C72, D03, D64, D74
Suggested Citation: Suggested Citation