What was the first economic system of humans?

Trade by barter

Explanation:

This economic system is known as the oldest economic system used by humans many years before money was first printed.

In this system, individuals traded their goods for another good that they wanted. It was not uncommon to see people trade copper for wheat or to trade a donkey for a dove.

This system made people to give out what they had (which they usually had in excess) for what they wanted.

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