Slim tops Gates in billionaire ranking

Carlos Slim, the telecommunications tycoon who controls Mexico's America Movil SAB (AMXL), is the richest person on Earth, according to the Bloomberg Billionaires Index, a daily ranking of the world's 20 wealthiest individuals.

The 72-year-old's net worth fell $478.4 million in a day to $68.5 billion as of the close of markets on March 2, as U.S. moguls Bill Gates and Warren Buffett placed second and third on the list compiled by Bloomberg News. Brazil's Eike Batista, who ranks 10th, still covets the top spot after vowing a year ago that he'd become the world's wealthiest man by 2015.