Rachel helps her colleague when he needs help with work.Although her behavior seems genuinely unselfish,Rachel expects her colleague to return the favor for her someday.This is an example of:

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Rachel's behavior is an example of reciprocal altruism, where one helps another with the expectation of receiving help in return in the future. This is different from kin selection, where individuals help related individuals to increase the chance of their genes being passed on, and in-group altruism, where individuals help members of their own group over outsiders. The mere-exposure effect refers to the phenomenon where people tend to like things they are familiar with, and is not relevant to this scenario.

Rachel Helps Her Colleague When He Needs Help with Work