I tested 5 marketing principles to see if they really worked
Nudge
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The Endowment Effect in Monkeys
The endowment effect is this evolutionary principle that has been visible in humans for thousands of years. In a study, researchers gave a monkey some peanut butter first and then offered it some juice. On average, only 21% of monkeys were willing to trade their peanut butter for juice. When they're given the juice first, the majority stay with the juice.
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