Question

what is the definition of double coincidence of wants?

Answer 1

the  phrase  "double  coincidence  of  wants"  was  used  in  jevons . 

Answer 2

Coincidence of wants is the reason that money is so important in an economic system. Or rather, I should say money is important because it is rare to have a coincidence of wants.Coincidence of wants occurs when two people have goods or services that they want to trade with one another.