A recipe for riots

People living in the towns of sub-Saharan Africa spend a bigger share of their income on food than do urban residents almost anywhere else in the world. Labourers often use up over half their wage just to eat. And since Africans tend to depend on a few staple crops, rises in cereal prices can be devastating. More money on food means less on school fees, sanitation and health. It may also mean more girls forced into prostitution and more violent crime

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