The Motley Fool has a nice quote from James Galbraith:
So there are two possibilities here. One is the theory is wrong. The other is that the market isn't rational. And if the market isn't rational, there's no point in designing policy to accommodate the markets because you can't accommodate an irrational entity.
Wired has a perfect companion piece on computer trading:
In late September, the Commodity Futures Trading Commission and the Securities and Exchange Commission released a 104-page report on the May 6 flash crash. The culprit, the report determined, was a “large fundamental trader” that had used an algorithm to hedge its stock market position. The trade was executed in just 20 minutes—an extremely aggressive time frame, which triggered a market plunge as other algorithms reacted, first to the sale and then to one another’s behavior. The chaos produced seemingly nonsensical trades—shares of Accenture were sold for a penny, for instance, while shares of Apple were purchased for $100,000 each. (Both trades were subsequently canceled.) The activity briefly paralyzed the entire financial system.
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