After a period of stagnation, why does a stock suddenly show a constantly changing bid of 600 shares 700 shares and back to 600 shares several times a second on the bid side? The bot is trying to test the market, but for what purpose?
Oh I see. So just before the stock takes off/nose dives too fast to humanly manipulator and/or trade, the manipulator turns on the HFT and tests it out to make sure that it's working...
That's what the financial media and the stock gurus and the trading books and the stock manipulators want you to believe.