In a market system individual economic units are free to interact each other in the marketplace.It is possible to buy commodities from other economic units or sell commodities to them.In a market,transactions may take place via barter or money exchange. In a barter economy,real goods such as automobiles,shoes,and pizzas are traded against each other.Obviously,finding somebody who wants to trade my old car in exchange for a sailboat may not always be an easy task.Hence,the introduction of money as a medium of exchange eases transactions considerably.In the modern market economy,goods and services are bought or sold for money.

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