Questions: Which one of the following is not a function of money? A. Unit of account. B. Open market operation. C. Medium of exchange. D. Store of value.

The answer is B. Open market operation.

A unit of account is a standard numerical unit of measurement of the market value of goods, services, and other transactions. It is one of the primary functions of money, as it provides a consistent measure for pricing and valuing goods and services.

Open market operations are activities by a central bank to buy or sell government bonds on the open market to regulate the money supply and influence interest rates. This is a monetary policy tool, not a function of money itself.

A medium of exchange is a function of money that facilitates the sale, purchase, or trade of goods between parties. It is one of the essential functions of money, allowing it to be used in transactions.

A store of value is a function of money that allows individuals to preserve value over time. Money can be saved and retrieved in the future, maintaining its value, which is a critical function of money.

If something is to be considered as money, it has to fulfill the functions of being a unit of account, a medium of exchange, and a store of value.