When store owners quote prices in terms of dollars, money is acting as a unit of account.
Money is anything that is generally chosen and accepted by a community as a medium of exchange and standard of value.
Money act as a unit of account because everything in the economy is quoted in terms of it. The price of any products or goods are quoted in terms of money.
Since there are many buyers and sellers in a country, unit of account stands as standard measurement for everyone in an economy; hence the foundation of every transaction in an economy.
Therefore, money is acting as a unit of account when store owners quote prices in terms of dollars.
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