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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% 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% 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.