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.

Jim, Alice, Rob Walton, Walmart
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14. Jim Walton (Right, pictured with brother Rob and sister Alice) -- The youngest son of Walmart founder Sam Walton, Jim Walton is also the chairman and CEO of Arvest Bank. He's worth an estimated $26.7 billion.

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