From Forbes:
Many people have pointed to the giant quote volumes on May 6 as being at least partly responsible for what turned into one of the weirdest days in stock market history. What happened yesterday was just as weird.
At precisely 10:00 a.m., quote volume across all exchanges ballooned. It was, to date, the most intense period, albeit short, of quoting to hit our markets yet...
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More on the flash crash:
Must-see video: The most exciting moment in CNBC history
Dan Ferris: What no one else will tell you about Thursday's crash
Jeff Clark: "Today will go down in history as a market changing event"