Warren Buffett invites the bears in

Warren Buffett's readiness to have his ideas challenged has been one of the drivers behind his success.

Early this year, Warren Buffett decided to shake up the format of the annual shareholders' meeting of Berkshire Hathaway, the conglomerate he has turned into the world's fifth-biggest company over the past 50 years. He challenged someone who was short Berkshire to come and put the bearish case to his shareholders, who converge on Nebraska each spring to hear 'the Sage of Omaha' dispense his wisdom.

Enter Doug Kass of Seabreeze Partners, who describes himself as "biased to the short side" and presents his ideas on Thestreet.com and CNBC, a US news channel. His good calls include advocating buying stocks in March 2009. He first outlined the bearish case against Berkshire in 2008, highlighting concerns that it had grown too big and unwieldy; faced stiffer competition; and would have to grapple with a tougher economic backdrop in the years ahead.

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