Question

why do you mean by double co incidence of wants​

Answer 1

Double co incedence of wants means two people who need different things by selling another different thing and needs are completed by selling and buying item of each other is called double co incedence of wants

For example

Person A needs 1 kg sugar and has 1kg wheat extra and he want to sell it

And person B needs 1kg wheat and has 1 kg sugar extra so they exchange items with each other to fulfill their demands.

It happened when there was no medium of doing payment like cash, coins were introduced.