Buffett letter may tout optimism as broader market worries ebb
February 22, 2018 at 07:08 AM EST
(Reuters) - Warren Buffett may use part of his annual letter to Berkshire Hathaway Inc shareholders, due on Saturday, to renew his optimism about America, at a time economic growth is on the upswing and U.S. stocks sit near record highs despite rising interest rates.