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What is the cause of famine? The obvious answer is shortage of food. But, says the Nobel-prize winning economist Amartya Sen that misses a vital point. In his research on famines, he showed that there’s usually enough food to go around – it just doesn’t reach the people who need it. Often that’s because news of food scarcity hasn’t been widely publicised. In democracies people don’t starve to death, he says, because there’s always pressure on the politicians to alleviate suffering. Presenter David Edmonds Producer Ben Cooper (Image: Bengal Famine, Credit: Getty Images)