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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The median income for a household in the town is $78,399, and the median income for a family is $89,566. Males have a median income of $60,179 versus $58,125 ...