Comment by acrum

If you've done any daytrading, you've seen these algorithms in action. I know a few folks who could make a small fortune daily just by "fooling" the algorithms by setting extraordinarily high or low order prices, and rarely actually filling one of those orders. There is lots of money to be had (and lost) by mathematicians in the stock market, and there is a lot to be said for technical analysis... but it's a jungle out there.