In this Wednesday, Feb. 6, 2013 photo, trader David O'Day works on the floor of the New York Stock Exchange, in New York. World stock markets were mostly higher Friday, Feb. 8, 2013,

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In this Wednesday, Feb. 6, 2013 photo, trader David O'Day works on the floor of the New York Stock Exchange, in New York. World stock markets were mostly higher Friday, Feb. 8, 2013, boosted by better-than-expected trade data from China that provided new evidence of an upswing in the world's second-largest economy. (AP Photo/Richard Drew) less