A famine looks like a simple problem: there is not enough food, so people starve. The history of famine says otherwise. Again and again, people have died of hunger in places where food was still being grown, sold and even shipped abroad. Understanding why is one of the most important lessons in the study of food.

Entitlements, not just supply

In 1981 the economist Amartya Sen published Poverty and Famines, a study of several twentieth century disasters. His central claim was that the usual explanation, a sudden drop in the amount of food available, often fails to fit the facts. What matters is whether people can get food. Sen described each person's entitlement: the food a person can command through what they grow, earn, trade or receive. A farm laborer's entitlement depends on wages and food prices. A fisherman's depends on what his catch will buy. A famine happens when large groups suddenly lose their means of obtaining food, even if the total supply has barely changed.

This shift in focus changes who is to blame and what can be done. If famine is a matter of purchasing power, then jobs, wages, prices and public relief matter as much as harvests. Sen also argued that famines are rare where governments face elections and a free press, because such governments cannot easily ignore mass starvation. Critics have tested that claim against hard cases, such as famines in the colonies of democratic states, but it remains one of the most cited ideas in the field.

Bengal, 1943

Sen built his theory partly on a famine he witnessed as a boy. In 1943, in British-ruled Bengal, somewhere between two and three million people died. Yet Sen found that Bengal's food supply in 1943 was not much lower than in earlier years without famine. The war had driven up prices, as military spending flooded Calcutta with money. Rice imports from Burma were cut off after the Japanese conquest. Fearing invasion, the authorities seized or destroyed thousands of boats along the coast, wrecking the livelihoods of fishermen and river traders. Speculators and frightened households held back grain. Rural laborers, whose wages did not keep pace with prices, were hit hardest, priced out of the market while Calcutta was supplied as a wartime priority. Historians still debate the weight of each cause, including decisions made in London about shipping and relief, but nearly all agree that the disaster was shaped by policy as much as by weather.

Ireland, 1845 to 1852

In Ireland the trigger was a plant disease. The Great Famine began when a potato blight destroyed the crop on which about a third of the population relied. The blight, a water mold now called Phytophthora infestans, had crossed from the Americas. About a million people died and at least as many emigrated. Ireland's population has still not returned to its pre-famine level.

Blight explains the crop failure but not the scale of the death. Many of the poorest families rented tiny plots and grew potatoes because nothing else could feed a family on so little land. When the potatoes rotted they had no money to buy anything else. Meanwhile grain and livestock kept leaving Ireland for British markets. The British government did fund relief at first, but leading officials believed strongly that the market should not be disturbed. They shifted the burden onto Irish landowners and local taxes, closed the soup kitchens in 1847 and tied relief to hard labor in workhouses and on public works.

China, 1959 to 1961

The largest famine in recorded history came from ideology. During Mao Zedong's Great Leap Forward, peasants were organized into giant communes, private plots were banned and millions of farmers were pulled into backyard steel production. Local officials, afraid of being branded enemies of the revolution, reported impossible harvests. The state set its grain quotas from these inflated reports, then took grain that villages needed to survive. When the defense minister Peng Dehuai raised concerns in 1959, he was purged, and few dared to speak again. Estimates of the death toll range from about 15 million to more than 40 million, with many scholars settling near 30 million. Grain exports continued through the worst years.

Worked example: reading a famine

Suppose a region's harvest falls by ten percent, and reports of hunger begin to spread. Sen's approach suggests a set of questions. Who has lost income? In Bengal it was laborers and fishermen; in Ireland, cottiers whose crop was their wage. What are prices doing? A modest drop in supply can set off panic buying and hoarding that push prices far beyond what the poor can pay. Is food leaving the region? In both Ireland and China it was. Can the hungry be heard? In China, fear silenced the very officials who could have sounded the alarm.

The answers point to remedies. Public works that pay wages, cash or food for those who have lost their entitlements, open reporting, and a willingness to halt exports have stopped many famines before they began. India, for instance, has faced severe droughts since independence without a famine on Bengal's scale, in part because a free press and elected governments made relief a political necessity. Famine, on this view, is rarely just a natural disaster. It is a failure of the arrangements that let people reach food.