1 Money is a good that acts as a medium of exchange in transactions. 2  Classically it is said that money acts as a unit of account, a store of value, and a medium of exchange.3  Most authors find that the first two are nonessential properties that follow from the third. Money is a good that acts as a medium of exchange in transactions. 2  Classically it is said that money acts as a unit of account, a store of value, and a medium of exchange.
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