The two features of money that distinguish it from all other assets in the economy are that money is the medium of exchange and common unit of account to express prices. So, option a. is correct.
Money is a medium of exchange. Barter was a way of exchanging goods for other goods before money was created. Like gold and other precious metals, money has value because it represents something of value to most people. Money is a commodity that is generally accepted as an economic medium of exchange. It is a medium for expressing prices and values. It circulates from person to person and country to country, facilitating trade and becoming a major measure of wealth.
Whether money is shells or stones, gold or paper, there are three main functions in any economy: As a medium of exchange, as a unit of account, and as a store of value. Of its three functions, it is as a medium of exchange that distinguishes money from other assets such as stocks, bonds, and homes. ”
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