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May 6, 2010 stock market decline/plunge: Why did it drop 9% in a few minutes?
I hate attributing an event like this to a single cause.  That implies that the market is an orderly system where everything operates smoothly.  I prefer to see it as much chaotic. When I see a drop like that happen, I'd say that there were a lot of sellers of stocks and all the buyers were bidding less and less for those few minutes.  Perhaps the catalyst for that was a typo or a strange order.  But in the end all the participants in the market responded by bidding down stocks, not just one person.  It takes sides to complete a trade. I know my model is a bit simplistic...  I'd be happy if someone corrected me :-)