In this Thursday, Feb. 21, 2013, photo, a trader works on the floor of the New York Stock Exchange. (AP Photo/Mary Altaffer)

Associated Press
In this Thursday, Feb. 21, 2013, photo, a trader works on the floor of the New York Stock Exchange.  (AP Photo/Mary Altaffer)
In this Thursday, Feb. 21, 2013, photo, a trader works on the floor of the New York Stock Exchange. (AP Photo/Mary Altaffer)
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