http://online.wsj.com/article/SB10001424052748703859204575525973854203534.html?mod=WSJ_hpp_LEADNewsCollection
What the SEC fails to report to you is that Algorithm trading is a very common use now by the Trade Industry. It's called HFT (high frequency trading). It's a market rig that makes money by creating illusion.
Computers are trading computers to make it look like there is liquidity creating volume of buys and sells. It should be against the law instead of widely used.
Federal regulators investigating the causes of the May 6 "flash crash" concluded a large trader's use of a computer trading system to sell futures contracts led to a rapid and sudden selling that triggered additional selloffs in an already unstable market
