I have to believe that the algo trading takes place without any regard to the generally accepted rules for shorting and ownership, since they initiate and unwind positions in milliseconds. In other words, the algos "invent" shares to sell without regard to trying to borrow from a current holder. The only requirement they have to follow is that everything gets covered by the end of the day. Therefore, we know there isn't any float available for trading but the algos could care less. All that volume was pure fiction, and the only time the price moved outside of "normal ranges" was when they had to cover open positions. The dumpage was all invented shares.
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