Warren Buffett tours the trade show floor during the Berkshire Hathaway Annual shareholders meeting in Omaha, in this May 5, 2012 file photo. Buffett's conglomerate Berkshire Hathaway Inc reported a larger profit for the third quarter November 2, 2012, as strength in the railroad and utility businesses, as well as investment gains, offset weaker results in the insurance units. REUTERS/Lane Hickenbottom/Files (UNITED STATES - Tags: BUSINESS) REUTERS