In many professional sports leagues, one team is not allowed simply to purchase a player from another team, so they have to trade which requires a double coincidence of wants. The coincidence of wants, also known as the double coincidence of wants.
It is a phenomenon in which two parties, each of whom is in possession of an object that the other desires, directly swap these items without the need of money. This has frequently been cited in economics as the basis of a trade in economy. However, professional research has not proven that this barter model actually operates in the real world.
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