Buffett's uncommon urge to chronicle made him a unique character in American life, not only a great capitalist but the Great Explainer of American capitalism. He taught a generation how to think about business, and he showed that securities were not just tokens like the Monopoly flatiron, and that investing need not be a game of chance. It was also a logical, commonsensical enterprise, like the tangible businesses beneath. He stripped Wall Street of its mystery and rejoined it to Main Street -- a mythical or disappearing place, perhaps, but one that is comprehensible to the ordinary American.