Geithner had for years warned that the explosive growth in credit derivatives—various forms of insurance that investors could buy to protect themselves against the default of a trading partner—could actually make them ultimately more vulnerable, not less, because of the potential for a domino effect of defaults. The boom on Wall Street could not last, he repeatedly insisted, and the necessary precautions should be taken. He had stressed these ideas time and again in speeches he had delivered, but had anyone listened? The truth was, no one outside the financial world was particularly concerned
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