A double coincidence of wants refers to the fact that for a barter trade to take place between two people, each person must want what the other one has
Double coincidence of wants occurs when the desires of both purchasers and sellers are satisfied at the same time during the transaction of products that both parties own. To sell and buy each other's goods, both parties the vendor and the buyer must agree. The direct exchange of goods takes place without the need of money.
In theory, a situation when two parties' wants coincide would require their consent in order to sell and purchase each good. In this system, issues occur because it is unlikely that the desires, needs, or occasions that lead to or motivate a transaction would take place at the same time and same location.
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