If a housewife has meat and wants tomatoes, she must find someone who has tomatoes to give and wants meat. This concept is described as
- scale of preference
- opportunity cost
- complementary demand
-
double coincidence of wants
The correct answer is: D
Explanation
Double coincidence of wants simply mean searching for those who need what you have and at the same time has what you need. It is a major barrier to barter trade.