Money is used for buying and selling goods and is therefore considered a medium of exchange.
A medium of exchange is a device or system that facilitates the sale, purchase, or trade of goods between parties.
Currency is the medium of exchange in modern economies.
If money, as represented by a currency, is no longer viable as a medium of exchange, or if its monetary units cannot be accurately valued, consumers lose the ability to plan budgets, and there is no way to accurately gauge supply and demand.
Using a medium of exchange improves an economy's efficiency and stimulates an increase in overall trading activity.
Hence, money is considered to be a medium of exchange.
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