Specialist Christopher Culhane works the trading floor of the New York Stock Exchange. Thursday, Sept. 6, 2012. (AP Photo/David Karp)

Associated Press
Specialist Christopher Culhane works the trading floor of the New York Stock Exchange. Thursday, Sept. 6, 2012. (AP Photo/David Karp)
Specialist Christopher Culhane works the trading floor of the New York Stock Exchange. Thursday, Sept. 6, 2012. (AP Photo/David Karp)
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