Joseph Mastrolia (left), a trader with Barclays, and Chris Casaliggi, Euronext floor manager, begin early trading on the floor of the New York Stock Exchange on Nov. 20, 2012. (Associated Press)

Photo by: Bebeto Matthews

Joseph Mastrolia (left), a trader with Barclays, and Chris Casaliggi, Euronext floor manager, begin early trading on the floor of the New York Stock Exchange on Nov. 20, 2012. (Associated Press)