Jeffrey Sachs, the Columbia University economist who is leading an effort to eliminate poverty and vastly reduce mortality and morbidity in the Third World, dreams grandly: According to Forbes magazine, there are some 950 billionaires in the world, with an estimated combined wealth of $3.5 trillion. Even after all the yachts, mansions and luxury living that money can buy many times over, these billionaires will still have nearly $3.5 trillion to save the world. Suppose they pooled their wealth, as [Warren] Buffett has done with Bill and Melinda Gates. By standard principles of foundation
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