World's richest billionaires

POSTED: 07:56 AM PST Mar 08, 2012    UPDATED: 07:32 AM PST Mar 04, 2013 

A Mexican billionaire tops Forbes' world's richest list for a fourth year in a row.

Powerful - Slim
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1. Carlos Slim Helu & Family -- The world's richest person for a third year in a row, the Mexican telecom mogul increased his new worth to more than $73 billion.

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