Threat to Slim from Mexican regulators

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Carlos Slim, the world's richest man, is fighting to shore up his dominance of the Mexican telecoms market, which made him a billionaire, as the country's regulators and courts turn against him.

The Mexican Supreme Court ruled that Mr Slim's America Movil, which trades as Telcel in Mexico, cannot continue to defy the country's telecoms regulator, and must cut the prices it charges rival companies when calls connect to the Telcel network.

The Federal Telecommunications Commission, Cofetel, fined America Movil $1bn (£604m) last month – a penalty the company says it will appeal against – and told it to cut interconnection fees.

Consumers and businesses blame Telcel and its fixed-line telecoms sister company Telmex for Mexico having some of the highest telephone bills in the industrialised world, and Cofetel concluded after a four-year investigation that the America Movil companies do indeed abuse a dominant position in the market.

The cigar-puffing Mr Slim inherited a property fortune from his father, an immigrant from Lebanon who first went into business running a general store in Mexico City, but he parlayed that into one of the world's largest business empires by snapping up industrial companies at a fraction of their book value when investors fled Mexico after its 1982 financial crisis. His political associations then helped him win control of the privatised monopoly Telefonos de Mexico (Telmex) in 1990.

The mobile phone business that grew out of Telmex is now the largest in Latin America, operating in many countries under the Claro brand; it has 231 million subscribers. But rival mobile phone companies in Mexico, including Grupo Televisa and Alestra, have complained that Telcel charges them too much in interconnection fees, and Cofetel has ruled in their favour.

Carlos Slim has come out top in the Forbes magazine rich list for the past two years. Forbes says he is worth $74bn (£45bn); Bill Gates is worth $56bn