Rationing of the country, through the 'levelling of consumption of essential foodstuffs'. To assist with rationing, ration books were introduced on 1918 for butter, margarine, lard, meat and sugar. During the war, average calories intake decreased only three percent, but protein intake six percent. Food rationing appeared in Poland after the First World War, and ration stamps were in use until the end of the Polish–Soviet War. Rationing became common during the Second World War. Ration stamps were often used. These were redeemable stamps or coupons, and every family was issued a set number of each kind of stamp based on
Rationing in Cuba to return to the previous area for their supplies. Products distributed through the "libreta" mechanism are sold at subsidized prices, which have been kept more or less stable since its inception (the mean salary of a worker has varied very little since, as well). The "libreta" contains a page for every month, where the clerk marks what products were withdrawn, and in which quantities. Cubans are required to present the "libreta" each time they buy the rations. At its inception, the rationing system included not only food products, but industrial products as well. Along with the "libreta", a tear-off coupon