The merger frenzy among the world's top exchanges could cast the U.S.-centric "flash crash" debate in a global light, as experts on Friday pitch some possibly radical changes meant to avoid another market breakdown. A special committee is set to meet in Washington to make its long-awaited recommendations to regulators -- now more than nine months since the unprecedented market crash sent the Dow Jones industrial average down some 700 points before rebounding, all in a matter of minutes. The May 6 crash rattled investors, exposed flaws in the structure of today's electronic markets, and set regulators on a mission to fix the high-speed system.
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