Mexico finally passed antitrust regulations last year to loosen Carlos Slim Helu's near monopoly over telephone users. But Slim, 75, retained his Forbes ranking as the world's second-wealthiest person, and he increased his personal worth by $5.1 billion, to $77.1 billion. That was largely thanks to the rising share price of AmericaMovil, the telecom operator that controls 80 percent of Mexico's landline and 70 percent of its mobile markets-along with sizable operations elsewhere in Latin America.
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