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Trick #3 – The Favor Trap This trick is extremely powerful. When someone does a favor for you first… your brain automatically feels the need to return that favor. Psychologists call this reciprocity. Even a small favor can make people feel obligated to help later. That’s why salespeople sometimes give free samples. Once you receive something… you subconsciously want to give something back. And often that “something” becomes a purchase or agreement.