The conventional explanation until 1951 for the cause of famines was the decline of food availability relative to the nutritional needs of the population (abbreviated as FAD for food availability decline). The assumption was that the central cause of all famines was a decline in food availability by reason of decline in food production or disruption of food distribution.[1] However this does not explain why only a certain section of the population such as the agricultural laborer was affected by famines while others were insulated from them. On the other hand, inequalities in wealth or ability to exit food shortage areas sufficiently explain such phenomena.[2]