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It must count among the world's most genial rivalries. Two of the planet's richest men regularly play epic games of on-line bridge and collaborate over handing out their billions. But Warren Buffett has unseated his friend, Bill Gates, to become the wealthiest individual on the globe.
The Nebraska-based investor known as the Sage of Omaha saw his fortune swell by $10bn (£5bn) to $62bn last year as he made a series of shrewd punts, including a bet on Brazil's currency and profit on the oil company PetroChina, which has drawn flak for its links to Sudan's government.