In this Sept. 20, 2012, file photo Trader Frederick Reimer works on the floor of the New York Stock Exchange. World stock markets fell Monday, Sept. 24, 2012 weighed down by a host of concerns about the global economy. (AP Photo/Richard Drew, File)

Associated Press
In this Sept. 20, 2012, file photo Trader Frederick Reimer works on the floor of the New York Stock Exchange. World stock markets fell Monday, Sept. 24, 2012 weighed down by a host of concerns about the global economy. (AP Photo/Richard Drew, File)
In this Sept. 20, 2012, file photo Trader Frederick Reimer works on the floor of the New York Stock Exchange. World stock markets fell Monday, Sept. 24, 2012 weighed down by a host of concerns about the global economy. (AP Photo/Richard Drew, File)
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