May 15: High-Speed Trading: Profit—And Danger—In Milliseconds

An earlier version of this article misspelled the last name of Jim Overdahl, a vice president at NERA Economic Consulting. And due to a transcription error, the precise wording of his comment was not correct. It should have read: "It allows them to quickly revise their quotes and offer better quotes because they're able to manage the risk of being picked off by better informed trader or traders with superior information about order flow or market moving news."

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