When fans and followers descend on Omaha for the Berkshire Hathaway Inc. annual meeting on May 5, they'll be eager to hear the homespun business wisdom and folksy investment advice of Chairman Warren Buffett. One thing they probably won't hear during his nearly six-hour Q&A with shareholders: the nitty-gritty on why he likes Wal-Mart Stores Inc. more than rival discounter Target Corp.
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