At the end of World War II, much of Germany was in ruins. Large parts of its infrastructure was attacked or bombed by the Allied Forces. The city of Dresden was completely destroyed. The population of Cologne had dropped from 750,000 to 32,000. The housing stock was reduced by 20%. Food production was half the level it was before the start of the war; industrial output was down by a third. Many of its men between the ages of 18 and 35, the demographic which could do the heavy lifting to literally rebuild the country, had been either killed or crippled.
During the war, Hitler had instituted food rations, limiting its civilian population to eat no more than 2,000 calories per day. After the war, the Allies continued this food rationing policy and limited the population to eat between 1,000-1,500 calories. Price controls on other goods and services led to shortages and a massive black market. Germany's currency, the reichsmark, had become completely worthless, requiring its populace to resort to bartering for goods and services.