Money is without a doubt a human invention. There are no recorded cases of any animal using an inanimate object to standardise the value of items and establish a non-bartering economy. Since childhood we learn of the value of money and how it can be used to purchase goods and services. In fact, money can be considered one of the fundamental pillars of human society that makes the world go round.
However, scientists have discovered that a currency system may not be such a novel system after all. In an experiment, a group of capuchin monkeys were given silver disks and were shown how they could use the disks as payment for a treat. Within a few months time, the monkeys realised that the disks had inherent value and began acting just like humans with money.
For example, they did not act in the standard way of operant conditioning (i.e. performing an action results in a reward), but responded to market forces in an accurate manner. If the “price” rose, their demand for treats would fall (i.e. buy less) and vice versa - following the law of demand that modern economics is based on. They even learnt to save the “money” to afford treats.
In a similar experiment with chimpanzees, it was found that chimps were even quicker in learning the concept of money and even learnt how to use smaller denominations of currency.
Things started to get interesting when a certain monkey sneaked into the chamber storing the “coins” and threw it into the communal cage, quickly escaping before the researchers came back. This was the first recorded case of a monkey bank robbery.
While this was happening, it was also observed that one male monkey was giving a female monkey a coin. The researchers wondered if this was an act of altruism or wooing, but soon discovered that the female monkey would receive the coin then have sex with the male, then later use the coin to buy food. The introduction of money immediately led to the invention of prostitution.