For starters, let's figure out, what is money? This is a special kind of commodity, which plays the role of a general equivalent, and has specific functions: means of payment, the accumulation, circulation, the measure of value.
Prerequisites for money were trade relationship between humans based on barter. At this point, people have started to realize the inconvenience associated with this system, it was expressed in the absence of a specific equivalent, which could be a fixed cost of goods allowing the deal between buyer and seller.
It is impossible to say exactly when the first money was used or officially adopted. One of the most ancient mentions about dates back for 4500 years and comes from a place located in the modern State of Iraq. It talks about the silver, as a due measure of payment. Money looked differently at different times.
Stone money, in the form of a disk, was used on the island of Yap (the Pacific Ocean) to pay for the litigation and the public expenditures. Among them were these giants up to 4 m in diameter.
Money-axes were used by native Americans in Mexico, they were kind of small axes made of copper. In addition to this money, the Indians also used cocoa beans for payment.
Ethiopian salt sticks from salt deposits were used as money until the 1920’s in Ethiopia.