In this Wednesday, Jan. 2, 2013, photo, traders work on the floor at the New York Stock Exchange in New York. A positive start to U.S. corporate earnings season and a sharp improvement in China's monthly trade helped boost world stock markets Thursday Jan. 10, 2013. (AP Photo/Seth Wenig)

Associated Press
In this Wednesday, Jan. 2, 2013, photo, traders work on the floor at the New York Stock Exchange in New York. A positive start to U.S. corporate earnings season and a sharp improvement in China's monthly trade helped boost world stock markets Thursday Jan. 10, 2013. (AP Photo/Seth Wenig)
In this Wednesday, Jan. 2, 2013, photo, traders work on the floor at the New York Stock Exchange in New York. A positive start to U.S. corporate earnings season and a sharp improvement in China's monthly trade helped boost world stock markets Thursday Jan. 10, 2013. (AP Photo/Seth Wenig)
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