World's richest billionaires

POSTED: 7:56 AM Mar 08 2012   UPDATED: 7:32 AM Mar 04 2013
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A Mexican billionaire tops Forbes' world's richest list for a fourth year in a row.

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Rick Wilking/Reuters

Mexican billionaire Carlos Slim Helu tops the Forbes' world's richest list for a fourth year in a row. Find out what other billionaires topped this year's list.

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