That Japanese Fat Finger Can ‘Absolutely’ Happen in U.S.

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A funny thing happened after Michael Lewis’s book “Flash Boys” put the structure of the U.S. stock market under a microscope in March: The whole system ran pretty smoothly, at least compared with its recent past.

Sure, the electronic cat-and-mouse trading game that Lewis called a “rigged” system and others called “market making” may not have changed much. On the bright side, however, there have been no major technological meltdowns like the one that almost bankrupted Knight Capital Group Inc. or fouled Facebook Inc.’s initial public offering in 2012, or caused an almost 1,000-point plunge in the Dow Jones Industrial Average in 2010.