21 Richest Billionaires In The World

12. Jim Walton

Facebook CEO Mark Zuckerberg talks about the new Facebook email service at an announcement in San Francisco, Monday, Nov. 15, 2010. AP Photo/Paul Sakuma)
Gareth Patterson/AP

Rating: $40.2 Billion

The youngest of the Walton children replaced his brother John on the company's board when he died in 2005, and has amassed a personal wealth thanks to his joint roles as CEO of his family owned Arvest Bank and chairman of newspaper firm Community Publishers Inc.

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