To: carranza2 who wrote (73362 ) 5/7/2010 3:40:51 PM From: Maurice Winn 1 Recommendation Respond to of 74559 C2, now I see what you meant. You meant the sudden extraordinary 1000 Dow plunge and then all within half an hour a zoom right back up to almost where it was and an even more impressive similar move in Proctor and Gamble and some other individual stocks. I have been ranting about such things for decades - people have been getting angry at computers doing share trading since 1987. Back then it was more people using computer programmes to tell them what to trade, now it's the computers doing what they like having been told by PhD mathematicians and others what to think. Look at the hopeless human response: <The near-instantaneous swings left brokers dumbfounded. Dermott W. Clancy, who runs a New York Stock Exchange broker, said Thursday was one of the five worst days he has seen in 24 years in the business. When the market dropped across all indexes in a matter of minutes, customers were calling him nonstop. “They’re calling saying ‘Is there something I’m missing? Is there somebody valuing these securities at this level? Is there some news in the marketplace I’m not aware of?’ ” he said. The answer — that it all started with an apparent error — infuriated Mr. Clancy. “There are so many things wrong with what happened today,” he said. “The market was never down one thousand points. Procter & Gamble should never have traded at $39. But a lot of people lost money as if the prices were meant to drop. This is an injustice to the public.” The whole trading system, Mr. Clancy said, went into what brokers call “slow mode.” When the large sell order came in, the market makers for each of those stocks were overwhelmed trying to sell that order and they could not take other orders. It was sort of like a traffic jam on one highway that spread to create traffic jams everywhere. Suddenly, traders started to distrust what they were seeing. “There was no pricing mechanism,” Mr. Clancy said. “There was nothing. No one knew what anything was worth. You didn’t know where to buy a stock or sell a stock. You didn’t know if the market was down $500 or $1,000.” > Clancy is wrong - people do know what things are worth. In fact, I am thinking I had better get some buy orders in and lie in wait for the computers to fall into my trap. More precisely, it would not be the computers who would fall into my trap but the foolish "stop" sellers and the like. What the computers have perhaps found is that people put stop loss sell orders in. If the computers see a swarm of queued sell orders, they can calculate, on a probabilistic basis, how far down through the sell orders they can carry the process before buying at the bottom then cleaning out all the buy orders on the way back up by selling to them the stock they bought at the bottom. The computers know that the brokers will get traffic jammed, leaving the fast thinking computers to act. So the computers initiate some selling to get the ball rolling. That plunges the price down stepping past all the STOP LOSS sell orders but the sell orders are still in and the computer bids are way below those STOP LOSS orders. The computers are dueling with each other, playing chicken, not wanting to be the last one to bail out going down or climb on going up. The mathematicians have to build models for how stock brokers react and how the competing computers react. I used to like chess and this is like multiplayer chess. I have my shorts done, so now I'm going to be a JPM and WFC buyer. Hmmmm.... I should choose a price in case the computers have another go at it, which they will, because that's what they do. They have been doing that for ages now, but this was the fastest and deepest. Perhaps with early troughs, the computers have had to consult the boss before carrying on. Back in the 20th century I used to rant about D E Shaw and co running their computers and people trying to compete with them. Computers haven't been getting slower or less intelligent. Mqurice