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Why some social systems form groups composed of kin, while others do not, has gone largely untreated in the literature. Using an individual-based simulation model, we explore the demographic consequences of making kinship a criterion in group formation. We find that systems where social groups consist of onegeneration breeding associations may face a serious trade-off between degree of altruism and group size that is largely mediated by their kin composition. On the one hand, restricting groupsdoi:10.2307/3473434 pmid:15278839 fatcat:f7vwvi3kcrbzxg3q4r6qlknh4u