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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. 

2. Warren Buffett

Shuji Kajiyama/AP/File
In this 2011 file photo, Warren Buffett attends the opening ceremony of a plant at the headquarters of Tungaloy Corp. in Iwaki city, in northern Japan.

Net worth: $50.2 billion

Wealth source: Berkshire Hathaway

Residence: Omaha, Neb.

World Rank: 4th

Mr. Buffett is widely considered the best investor of the past century. His investment firm Berkshire Hathaway operates a broad range of businesses, including Geico insurance and MidAmerican Energy. It also owns over $1 billion in Coca-Cola stock, as well as shares of Procter & Gamble and American Express.

Buffett has pledged to give away nearly all of his wealth to charitable causes, and is lately famous for being an outspoken advocate of higher tax rates for wealthy Americans. 

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