Robert Cialdini, a researcher on the psychology of influence, told Lewis that reciprocity is trained into the young in every human society anthropologists have studied. You must not take without giving in return.
His favorite proof is a study in McDonald's restaurants in Colombia and Brazil, where kids got a balloon either on the way in or on the way out.
The surprise was the coffee: parents ordered 20% more of it, because a favor done for your child lands on you. Robert says that favor leaves you grateful and obligated at once.
Lewis knows the other side, from a year and a half broke on his sister's couch, eating her food and paying no rent. “That's all I wanted to do,” he said, “is constantly give back.”
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