Money serves as a unit of account. This allows the value of many different types of goods and services to be compared.
Money serves as a medium of exchange.
A medium of exchange is something that can be used to purchase goods and services and pay debts. When money functions as a medium of exchange, goods and services can be exchanged without resorting to barter. Money serves as a store of value. Money is a way for households to store their savings. The Money Supply 1.