100 richest people: Meet the 10 richest Americans

The 100 richest people in the world gained $241 billion in net worth last year, according to Bloomberg's Billionaires Index. Americans dominated the list, occupying five of the top 10 spots. This countdown of the top 10 wealthiest Americans features a casino mogul, software tycoons, and a lot of Wal-Mart money. 

7. Jim Walton

Seth Perlman/AP/File
In this 2011 file photo, the Wal-Mart logo is displayed in Springfield, Ill.

Net Worth: $27.1 billion

Wealth Source: Wal-Mart

Residence: Bentonville, Ark.

World Ranking: 13th

 The younger Walton son manages the family’s private business ventures and serves as the chairman for the Walton-owned Arvest bank. He personally owns 347 million Wal-Mart shares. 

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