for example if you naked short sold 500 mill shares in any major and that caused that index to fall dramatically...then bot trading takes over and sells into a black hole....you could then buy up your shorts and while your at it buy up anything else that got caught up in the plunge..
man...think of the damage that could be down.....just because of a computer program
pretty simple for to bring down an ecomomy....you would think that we would have learned from the 87 crash.