Groups of caphuchins have been taught how to use currency. The scientists gave them currency for performing simple tasks and taught them that different amounts of currency could buy them different kinds of food. Some of the capuchins saved their currency, some of them spent the currency on food as soon as they got it, etc. Then the scientists noticed that the capuchins began exchanging currency among one another (specifically, some of the monkeys paid for sex) and attempted to steal from one another.
Basically, we humans are just monkeys. We are incentivized just like monkeys and we behave in the same way.
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