Carlos Slim, 72, a telecommunications tycoon who controls Mexico’s America Movil SAB, is the richest person on Earth, according to the Bloomberg Billionaires Index, a daily ranking of the world’s 20 wealthiest individuals. His 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. Gates, 56, is worth $62.4 billion, down $102.1 million on March 2 and up 11 percent year to date. Buffett, 81, saw his fortune decline $336.9 million to $43.8 billion on March 2 and is up 2.4 percent in 2012, Bloomberg said.