We sometimes talk about hunger in the world as if it were a scourge that all of us want to see abolished, viewing it as comparable with the plague or aids. But that naïve view prevents us from coming to grips with what causes and sustains hunger. Hunger has great positive value to many people. Indeed, it is fundamental to the working of the world's economy. Hungry people are the most productive people, especially where there is a need for manual labour.