http://changeyourthoughts.i2p/what-money-is
But they still had the disadvantage to be too heavy. the same issue appeared and another layer of abstraction came to be. Paper Money We are now at the point of paper money. Which came to be, because coins were still to heavy and big trades would not be feasible. Instead of keeping the metal near you, you would leave it at an early form of a bank and get a piece of paper that gave you the right to get it back at any time.
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