The world's wealthiest billionaires

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.

"I'm competitive," Batista, who trails Slim by almost $39 billion, said in a March 2 telephone interview from Rio de Janeiro. "It's Brazil's time to be No. 1. Brazilians have always admired the American dream. What's happening in Brazil is the Brazilian dream and I happen to be the example."

The Bloomberg Billionaires Index takes measure of the world's wealthiest people based on market and economic changes and Bloomberg News reporting. Each net worth figure is updated every business day at 5:30 p.m. in New York. The valuations are listed in U.S. dollars.

Today's ranking was published with the release of new billionaires profile pages in the Bloomberg Professional service. The profiles feature a transparent analysis of how each billionaire's fortune was calculated.