http://cyt.i2p/what-money-is
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. The idea of just a piece of paper and the trust to have access to it was enough to change the medium of exchange again.
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