Stocks rose on Wall Street Friday as the Standard & Poor's 500 index closed above 1,500 for the first time since the start of the Great Recession in 2007. Apple stock continued to decline, allowing Exxon Mobil to once again surpass the electronics giant as the world's most valuable publicly traded company
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.