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[iOwnSomeNVEI]

There is a lot of factors involved, I think those factors happened after those terrorists pulled their money out, like a chain reaction. They pulled billions of dollars out of the market in a short time and people thought the market was starting to crash, people then started to pull their money out.
Companies such as Enron, etc., got busted for cooking the books because the share price was not there to support the extra profit. Like writing a check for $100,000 to buy a winning stock when you don't have the funds. You buy you sell make a profit and put the funds in the bank before the check clears.
Im sure this went on for years.

The terrorists pulled their money out, investors got spooked and companies like Enron got busted because they could not recover the money.