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By Roman Frydman and Michael D. Goldberg - Confidence seems to be returning to markets almost everywhere, but the debates about what caused the worst crisis since the Great Depression show no sign of letting up. Instead, the spotlight has shifted from bankers, financial engineers and regulators to economists and their theories. This is not a moment too soon. These theories continue to shape the debate about fiscal stimulus, financial reform, and, more broadly, the future of capitalism, which means that they remain a danger to all concerned.