Francesco Guerrera writes that two issues -- the fake tweet that sent the markets on a brief but wild ride and the Chicago Board Options Exchange's delayed opening due to a software glitch -- are just the latest in a series of tech-related problems. "The common thread among all these incidents is the clash between a highly regulated world -- financial markets -- and the less-policed arena of the information-technology and Internet domains," Guerrera writes. "The former has come to rely on the latter to such a degree that costly mistakes are happening with worrying frequency."

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