Systemic risk is on everyone's agenda and was at the center of the agenda at the Group of 20 summit in London.

Ideas are floating about — a European Union risk supervisor; the U.K. Financial Services Authority's "college of supervisors"; Treasury Secretary Timothy Geithner's call for a single independent regulator with responsibility over systemically important firms and critical payment and settlement systems; Securities and Exchange Commission Chairman Mary Shapiro's call for a "college of regulators."

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