In 2013, the world’s got even richer, adding $524 billion to their collective net worth, according to the Bloomberg Billionaires Index. Check out who some of them are and what got them on this list.
Bill Gates Gates, the founder and chairman of Microsoft, was the year's biggest gainer. The 58-year-old tycoon's fortune increased by $15.8 billion to $78.5 billion, according to the Bloomberg Billionaires index. Stan Honda/AFP/Getty Images Buy Photo