Money functions are all of these i.e. "a medium of exchange. a unit of account. a store of value".
Since it is used to make purchases and pay for the commodities and services that one needs, money serves as a medium of exchange. Money is used to quantify the relative value of the commodities and services offered in society, making it a useful unit of account.
Money serves three purposes: as a unit of account because it quantifies the value of goods and services; as a store of value because it suggests that accumulating money increases people's and organizations' wealth; and as a medium of exchange because it enables trade between buyers and sellers using a common currency that is recognized by both parties.
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