U.S. billionaire investor Warren Buffett (C), chairman and CEO of Berkshire Hathaway, greets people as he visits an exhibition on his invested companies before the Berkshire Hathaway's annual shareholders meeting in Omaha, Nebraska, the United States, on May 5, 2018. Berkshire Hathaway held its 2018 shareholders meeting on Saturday, attended by tens of thousands of people from all over the world. (Xinhua/Wang Ying)