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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 …
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sustain a conflict-free outcome, are viable <p> if players have enough information about opponents’ preferences. However …
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