The G-20 summit gets underway today in Pittsburgh, and world leaders are hoping this big economic pow-wow will help stabilize a global economy still struggling back to its feet. For an assessment of how the global financial system is faring ? and to gauge if bankers have held off an even Greater Depression than the last one ? we turn to Liaquat Ahamed, author of "Lords of Finance: The Bankers Who Broke the World."

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