Concept:This concept refers to a special condition required for barter trade to take place.
Explanation:In barter, goods are exchanged directly without money.
A successful exchange requires each party to have what the other wants.
Here, the housewife has meat but needs tomatoes.
So she must find someone who has tomatoes and wants meat.
This mutual and simultaneous matching of wants is called double coincidence of wants.
Without this condition, a barter transaction cannot occur.
Answer:D. double coincidence of wants