War rationing is the controlled distribution of scarce resources, goods, or services. Rationing controls the size of the ration, one's allotted portion of the resources being distributed on a particular day or at a particular time.Rationing using coupons is only one kind of non-price rationing.
Authorities which introduce rationing often have to deal with the rationed goods being sold illegally on the black market.
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This is very, very brief!