Quote from achilles28:
I think his main gripes are flash orders, quote stuffing, and to a lesser extent, co-location. Anything that violates FIFO and obfuscates the book (quote stuffing) is abusive and should be banned. The equity flash crash is obviously the result of HFT'ers, since prior to bots, localized micro-crashes (and rebounds) didn't exist, at least to my knowledge. What that's the result of, I don't know. But obviously detrimental to investor confidence in US equity markets. I won't trade stocks because of it. Interesting that futures hadn't experienced the same intra-day liquidity vacuums and rebounds that stocks did. I imagine from the regulatory disparity between the SEC and CFTC governing HFT. Anyway, those are my thoughts. I'm no expert.