(NPR) If you thought Microsoft founder Bill Gates was raking it in, look up Carlos Slim Helu. The Mexican telecommunications magnate has reportedly become the world's richest man. A Mexican journalist says Helu, who heads the phone company Tel Mex, is worth nearly billion. In its most recent report, Forbes magazine says he's not worth quite that much. They still rank him behind Gates -- billion to billion respectively. Helu says he doesn't pay much attention the rankings, since he's not in a race to the top.