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1 " A person can trigger a feeling of indebtedness by doing us an uninvited favor (Paese & Gilin, 2000). Recall that the rule states only that we should provide to others the kind of actions they have provided us; it does not require us to have asked for what we have received in order to feel obligated to repay. "
― Robert B. Cialdini , Influence: Science and Practice: The Comic