You don't become a billionaire by making a lot of bad bets. But two of the world's richest men are now on opposite sides of a wager that may see one of them lose a fair chunk of change.
The two men: Warren Buffett, whose mastery of value investing has helped him accumulate more than $40 billion, and Carl Icahn, the corporate raider who has earned more than $8 billion with astute and aggressive stock plays.
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To follow this discussion on MSN BRK Shareholders' board.
So, who is right?