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 the size of the family, ages of children and income. The British Ministry of Food refined the rationing process in the early 1940s to ensure the population did not starve when food imports were severely restricted and local production limited due to the large number of men fighting the war.