How scientists taught monkeys the concept of money. Not long after, the first prostitute monkey appeared

From zmescience.com:

Something else happened then too, tough , in what’s maybe the most evident form of one’s grasp upon currency. The idea is that you can use money as a form of currency to exchange for goods or services, as in not just food. Well, one of the researchers, during the chaos event, observed how one of the monkeys exchanged money to another for sex. After the act was over, the monkey which was paid immediately used it to buy a grape…

There you have it folks, sounds familiar? In almost all aspects, capuchins manage to understand money and use it in a manner not too different from a plain old homo sapiens. The study, titled “How Basic Are Behavioral Biases? Evidence From Capuchin Monkey Trading Behavior”, can be read here.