In economy, barter is an operation of bilateral or multilateral exchange of goods or services between two or more economical subjects, companies, bodies, governments and so on without money. Barter usually is considered the first historical form of commercial exchange of goods, equivalent between parts, without a unit of monetary value of the goods themselves. The value of equivalence is obtained with a consideration of quality and quantity of the goods exchanged, according to the agreement of parts, that often refers to reasons of mutual needs. Even in barter then, the value of the exchanged goods is the meeting point between demand and supply.
We can distinguish between simple barter, when parts wants to receive the goods or service giving their own goods or service, and multiple barter when a person exchanges the goods or service received from the first exchange to obtain some other things. This can happen also if the wished goods can’t be given at once.