Carlos Slim Helu & family
Every Sunday, Slim's father would give him a 5-peso allowance and required him to record his purchases in a ledger.
Before going into business, Slim taught algebra at UNAM, a university in Mexico City.
Mexico's richest person, Carlos Slim Helú and his family control América Móvil, Latin America's biggest mobile telecom firm.
With foreign telecom partners, Slim bought a stake in Telmex, Mexico's only phone company, in 1990. Telmex is now part of América Móvil.
He also owns stakes in Mexican construction, consumer goods, mining and real estate companies. He previously held a 17% stake in The New York Times.
His son-in-law Fernando Romero designed the Soumaya Museum in Mexico City, home to Slim's extensive, eclectic art collection.
Slim and his family own 79% of Grupo Carso, one of Latin America's largest conglomerates.
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