Amartya Sen, this year's Nobel prizewinner in economics, has helped give voice to the world's poor. And that is no small matter, for the very lives of the world's poor may depend on having their voices heard. In a lifetime of careful scholarship, Sen has repeatedly returned to a basic theme: even impoverished societies can improve the well-being of their least advantaged members. Societies that attend to the poorest of the poor can save their lives, promote their longevity and increase their opportunities through education and productive work. Societies that neglect the poor, on the other hand, may inadvertently allow millions...
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