Some academics are said to live in ivory towers. Jeffrey Sachs, 50, is a pioneer of the mud-hut school of thought. He is an economist who loves statistics because they are pictures of people's lives-- people, in many cases, for whom economics means working out how to feed a family on less than a dollar a day. The equations in Jeff's head interest him because they reveal how we might be able to change the world we inhabit.
The title of his new book, The End of Poverty, sounds lofty. It is lofty. But a poverty of ambition isn't going to...
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