World's richest billionaires

Published: Mar 08 2012 10:56:15 AM EST   Updated On: Mar 04 2013 10:32:52 AM EST

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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