One of the biggest occupants of the World Trade Center was Morgan Stanley, an investment bank. In the first week of September, an average of 27 put option contracts was bought each day in its shares. The total for the three days before the attacks was 2,157. Merrill Lynch, another World Trade Center tenant, saw 12,215 put options bought in the four days before the attacks, when the previous days had seen averages of 252 contracts a day.

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