Purchasing using a debit card best exemplifies money serving as a medium of exchange
A medium of exchange is a device or system that acts as a middleman in transactions involving the exchange of goods between parties. A system must represent a standard of value in order to serve as a medium of exchange. All parties must concur to that norm as well. Currency serves as the medium of exchange in contemporary economies.
Credit and debit cards are frequently used for purchases. One could easily wonder how these cards fit into the measuring and analysis of money since money is the medium of exchange.
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