If a housewife has meat and wants tomatoes, she must find...
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
Correct answer is D
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.
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