This is a well understood trading technique. I have software for back-testing and buying the biggest decliners at an interim or final bottom works a huge percentage of the time for a quick buck.
We are at the early stages of this mess. The double Freddies are likely in big trouble, as are some banks and investment banks. Lehman announced today they will seek $6 billion in new capital. It will really hit the fan when the next big boy can't get new capital and goes under.
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