Reciprocal altruism: Helping and forming bonds with nonrelatives

It was the birthday of a co-worker of Monica’s. It had been four years now them working together. Previously, they just used to greet each other on their respective birthdays. But this year Monica’s friend gave her a gift on her birthday. Monica felt compelled to the same for her friend, even...

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Published on September 10, 2016 07:52
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