Warren Buffett

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FILE - In this file photo from May 1, 2013, billionaire investor Warren Buffett attends a seminar in Omaha, Neb. Buffett’s failure to beat the stock market in four of the past five years has inspired debate about whether Berkshire Hathaway’s 83-year-old CEO has lost his touch. Buffett and Berkshire Vice Chairman Charlie Munger are likely to face questions about the conglomerate’s performance when more than 30,000 shareholders gather for the company’s annual meeting in Omaha on Saturday. (AP Photo/Nati Harnik, File)

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FILE - In this file photo from May 5, 2013, Investor Warren Buffett high-fives a participant in a 5K run and walk organized by the Brooks Running Company, a Berkshire Hathaway subsidiary, in Omaha, Neb. Buffett’s failure to beat the stock market in four of the past five years has inspired debate about whether Berkshire Hathaway’s 83-year-old CEO has lost his touch. Buffett and Berkshire Vice Chairman Charlie Munger are likely to face questions about the conglomerate’s performance when more than 30,000 shareholders gather for the company’s annual meeting in Omaha on Saturday. (AP Photo/Nati Harnik, file)

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FILE - In this file photo from May 1, 2013, billionaire investor Warren Buffett applauds during a seminar in Omaha, Neb. Buffett’s failure to beat the stock market in four of the past five years has inspired debate about whether Berkshire Hathaway’s 83-year-old CEO has lost his touch. Buffett and Berkshire Vice Chairman Charlie Munger are likely to face questions about the conglomerate’s performance when more than 30,000 shareholders gather for the company’s annual meeting in Omaha on Saturday. (AP Photo/Nati Harnik, file)

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FILE - In this May 6, 2013, file photo, Berkshire Hathaway CEO and Chairman Warren Buffett speaks during an interview in Omaha, Neb. Buffett says he disapproves of Coca-Cola’s highly contested pay plan for its executives. Buffett, the beverage maker’s largest shareholder, called the plan “excessive” in an interview on CNBC after it was approved at the company’s annual meeting. But he said Berkshire Hathaway abstained from voting against the pay plan because he didn’t want to express disapproval of the company’s management. (AP Photo/Nati Harnik, File)

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Billionaire investor Warren Buffett wears Creighton stickers as he pretends to propose to eight-year-old McKenna Lutz, unseen at left, prior to the start of an NCAA college basketball game in Omaha, Neb., Saturday, March 8, 2014. (AP Photo/Nati Harnik)

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Billionaire investor Warren Buffett wears Creighton University stickers as he talks to Creighton students Nick Marnai of San Francisco, center, and Ryan Gardner of St. Louis, right, prior to an NCAA college basketball game against Providence in Omaha, Neb., Saturday, March 8, 2014. (AP Photo/Nati Harnik)

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Billionaire investor Warren Buffett wears Creighton stickers prior to an NCAA college basketball game in Omaha, Neb., Saturday, March 8, 2014. (AP Photo/Nati Harnik)

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Billionaire investor Warren Buffett wears Creighton stickers as he pretends to propose to McKenna Lutz, 8, prior to the start of an NCAA college basketball game in Omaha, Neb., Saturday, March 8, 2014. (AP Photo/Nati Harnik)