FILE - In this Feb. 10, 2011 file photo, American flags fly in front of the New York Stock Exchange, in New York. U.S. stocks opened higher Monday, Aug. 10, 2015, as investors assessed the latest corporate deal news. Precision Castparts led industrial stocks higher after Warren Buffett's Berkshire Hathaway agreed to buy the maker of aircraft components for $32 billion. (AP Photo/Mark Lennihan, File)