What is a lack of double coincidence of wants?

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The lack of a double coincidence of wants is a major reason why it is important to have a system of money.

Without money, we need to barter.  But barter depends on a double coincidence of wants.  If you and I are to barter, I must have what you want and I must want what you have.  The same applies to you.  If we do not meet this criterion, we lack a double coincidence of wants.  If I have what you want, but you don't have what I want, we do not have a double coincidence of wants and we can't trade.

Because of this, it is much better to have a system of money.  Then we do not need to have this double coincidence.

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