Altruism in which one organism provides a benefit to another in the expectation of future reciprocation. It would only be expected to evolve in the presence of a mechanism to identify and punish "cheaters".
An example of reciprocal altruism is blood-sharing in the vampire bat[?].
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... a household in the town is $44,583, and the median income for a family is $52,500. Males have a median income of $47,917 versus $31,250 for females. The per capita income ...