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Subjects (n = 64) pay costs to punish selfishness, but rarely punish fairness and become more systematic with age. We plot the proportion of trials in which 6-y-olds (n = 32) and 8-y-olds (n = 32) engaged in costly third-party punishment of fair and selfish allocations. Error bars reflect ± 1 SEM (clustered on subject to account for repeated observations).
