Here's something that might help... According to http://www.nytimes.com/2010/05/07/business/economy/07trade.html http://www.nytimes.com/2010/05/07/business/econ

Here's something that might help... According to http://www.nytimes.com/2010/05/07/business/economy/07trade.html http://www.nytimes.com/2010/05/07/business/economy/07trade.h... "In recent years, what is known as high-frequency trading — rapid automated buying and selling — has taken off and now accounts for 50 to 75 percent of daily trading volume." From what I've read, its gotten pretty ridiculous overall.