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" "As a social force, Reciprocation is one of the primary psychological tendencies that underlie human cooperation. The “You scratch my back, I’ll scratch yours” instinct is powerful and forms the foundation of friendships and alliances. Historically, gift giving was how the powerful remained in Power: in throwing lavish parties or generously awarding titles and land, leaders increased their influence by amassing a store of favors that could be called in during times of need.
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