A specialist checks a screen as his post on the floor of the New York Stock Exchange Tuesday, Jan. 22, 2013. World stock markets fell Wednesday Jan. 23, 2013 ahead of a U.S. vote on

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A specialist checks a screen as his post on the floor of the New York Stock Exchange Tuesday, Jan. 22, 2013. World stock markets fell Wednesday Jan. 23, 2013 ahead of a U.S. vote on raising the nation's borrowing limit. (AP Photo/Richard Drew) less