Wall Street had its worst day more than six years after hectic and historic weekend brought the quick demise of two of America's oldest and best-known investment banks.
Stocks dropped dramatically -- with the Dow closing down 504.48 points -- after 158-year-old brokerage firm Lehman Brothers filed for bankruptcy this morning and the other Wall Street stalwart, Merrill Lynch, was sold to Bank of America for $50 billion.
The Dow's fall of 4.42 percent today was the worst single day for the index...
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