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Warren Buffett, chairman of Berkshire Hathaway Inc., greets Ariel Hsing, an American table tennis player who competed in the 2012 Olympics, during a shareholder event on the sidelines of the Berkshire Hathaway Inc. annual shareholders meeting in Omaha, Nebraska, U.S., on Sunday, May 3, 2015. More than 40,000 people were expected to attend yesterday's Berkshire Hathaway annual meeting, which marks Warren Buffett's 50th year running the company. Photographer: Daniel Acker/Bloomberg via Getty Images

Warren Buffett, chairman of Berkshire Hathaway Inc., greets Ariel Hsing, an American table tennis player who competed in the 2012 Olympics, during a shareholder event on the sidelines of the Berkshire Hathaway Inc. annual shareholders meeting in Omaha, Nebraska, U.S., on Sunday, May 3, 2015. More than 40,000 people were expected to attend yesterday's Berkshire Hathaway annual meeting, which marks Warren Buffett's 50th year running the company. Photographer: Daniel Acker/Bloomberg via Getty Images