Trader Michael Smyth, left, and Gregory Rowe work on the floor of the New York Stock Exchange, Thursday, May 2, 2013. Stocks are opening higher on Wall Street, a day after the market's biggest fall in two weeks, after General Motors and other big companies announced higher profits. (AP Photo/Richard Drew)

Associated Press
Trader Michael Smyth, left, and Gregory Rowe work on the floor of the New York Stock Exchange, Thursday, May 2, 2013. Stocks are opening higher on Wall Street, a day after the market's biggest fall in two weeks, after General Motors and other big companies announced higher profits. (AP Photo/Richard Drew)
Trader Michael Smyth, left, and Gregory Rowe work on the floor of the New York Stock Exchange, Thursday, May 2, 2013. Stocks are opening higher on Wall Street, a day after the market's biggest fall in two weeks, after General Motors and other big companies announced higher profits. (AP Photo/Richard Drew)
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