If jeffrey sachs, itinerant adviser to A poor-country governments, scourge of the International Monetary Fund, head of Columbia University's Earth Institute, United Nations' expert of choice on third-world development, and much else besides, were ever to retire (an improbable scenario, admittedly) statistics would show a perceptible downward shift in global output. The man's productivity is staggering. No sooner has the UN published its huge new report on the Millennium Development Goals, drawn up under Mr Sachs's supervision, than the phenomenon is in print again. With typical moderation, Mr Sachs has entitled his new book, "The End of Poverty".
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