Evolution of money pt.1
We didn't always have a dollar bill, there was a time men lived without actual money(coins or notes). It was in those times that money was truly defined, apart from the banks and government. Money was decentralized(left to man to decide). Man is born to interact, and the major point of interaction for a man is an exchange of value, transacting what you have for what you need, man being communal will always look for a way to transact in this manner - exchange value. This intrinsic drive eventual