When there is a disaster or a calamity, the production of food grains decreases in the affected areas. This in turn creates a shortage of food in the area. Due to the food shortages, the prices go up. The raised prices of food affect the capacity of many people to buy the same. When a calamity occurs in a very wide area or is stretched over a long period of time, it may cause a situation of starvation. Massive starvation can take the form of famine.