Money

Money is a system of value that facilitates the exchange of goods in an economy. Using money allows buyers and sellers to reduce their transaction costs. The main functions of money are distinguished as: a medium of exchange, a unit of account, a store of value and sometimes, a standard of deferred payment.
The first types of money were commodities, whose physical properties made them desirable as a medium of exchange. In contemporary markets, money can include government-issued legal tender or fiat money, money substitutes, fiduciary media, or electronic cryptocurrencies.