In this Tuesday, Aug. 13, 2013 photo, specialist John O'Hara, left, works with traders at his post on the floor of the New York Stock Exchange. U.S. stock futures are edging higher Tuesday, Aug. 20, 2013, after a four-day sell-off that shaved more than 300 points off the Dow Jones industrial average. (AP Photo/Richard Drew)

Associated Press
In this Tuesday, Aug. 13, 2013 photo, specialist John O'Hara, left, works with traders at his post on the floor of the New York Stock Exchange. U.S. stock futures are edging higher Tuesday, Aug. 20, 2013, after a four-day sell-off that shaved more than 300 points off the Dow Jones industrial average. (AP Photo/Richard Drew)
In this Tuesday, Aug. 13, 2013 photo, specialist John O'Hara, left, works with traders at his post on the floor of the New York Stock Exchange. U.S. stock futures are edging higher Tuesday, Aug. 20, 2013, after a four-day sell-off that shaved more than 300 points off the Dow Jones industrial average. (AP Photo/Richard Drew)
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