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It reduces the bid/ask spread if there are more bidders and askers all doing their thing all the time: http://www.tradersmagazine.com/news/hfts-spreads-credit-suis...

This part is actually a good thing. That said, I remain gobstopped that HFT is such a whipping boy in a world where no one responsible for the 2008 crash has been prosecuted or jailed.

The incident here seems to either be a clocking artifact or an excellent exploit of a momentary inefficiency in the market - just the sort of thing traders spend their careers on hunting down and exploiting - so why... so... serious???



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