Answer:
The function that allows money to be used to make purchases is unit of account.
Step-by-step explanation:
There are four functions of money namely; a unit of account, a store of value, a medium of exchange and a standard of differed payments. Money is a unit of account because it can be used to determine the value of goods and services.Using money will allow buyers and sellers make purchases and sales independently. A unit of account is divisible, fungible and countable.