trade. He said that money should satisfy the following four characteristics: It must be durable. Money that fades or corrodes or changes form over time will not work as a medium of exchange. Of what use are the feathers that I gave you yesterday if they break tomorrow? It must be portable. Money should be easily handled, and have high worth packed into small, pocket-sized units. This is one reason why we don’t use oil as money. It would be rather inconvenient lugging around a barrel with you wherever you went. It must be divisible. We should be able to break down money into smaller units,
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