Barter is a completely inadequate mechanism to trade in a modern advanced economy. A barter is a transaction in which two or more persons exchange their products or services without exchanging the cash. In its simplest form, barter entails exchange of one party's good or service for another party's goods or service.
When two people each have goods the other wants, they can figure out mechanism of what those things are worth and how much to give to make the most use of their resources. Barter predates the creation of actual hard cash and is world's oldest form of trade.
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