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.

Bill Gates, Microsoft
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B Mathur/Reuters

2. Bill Gates -- Gates, chairman and co-founder of Microsoft Corp., is also co-chairman of the Bill & Melinda Gates Foundation. His net worth is more than $67 billion.

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