Net Worth: $74 billion UP
The world’s richest person for a second year in a row, the Mexican telecom mogul is also the year’s biggest gainer, having added $20.5 billion to his fortune and widened the gap between him and No. 2, Microsoft cofounder Bill Gates, to $18 billion. A 19 percent rise in the Mexican stock market, a stronger peso, and successful mining and real estate spinoffs from conglomerate Grupo Carso all contributed to the astonishing increase. He also merged his fixed-line telecom company into America Movil, Latin America's largest wireless carrier; the Slim family stake in that holding accounts for 62 percent of his net worth. He has other holdings in retailer Saks and the New York Times. Recently unveiled a new building for his Soumaya Museum, which houses his vast art collection. It is open to the public for free.
(Chris Goodney/Bloomberg via Getty Images) More from Forbes: The World’s Richest Women Billionaires 2011 The World’s Youngest Billionaires 2011 Notable Newcomer Billionaires 2011