
It used to be that the value of goods and services were expressed in terms of other goods. This was called the barter system. Carrying around goods as a medium of exchange can be a little cumbersome, so some economies began to use specific goods, such as feathers, polished stones, special metals (gold & silver) as a medium of exchange. The first coins were made from gold and silver. During the Middle Ages, economies began to use paper money to exchange value
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