America Movil Dives as Mexican Economy Slows Unexpectedly

America Movil SAB, the mobile-phone company controlled by billionaire Carlos Slim, lost a 10th of its value after saying slower Mexican economic growth hurt voice revenue in the fourth quarter and in January.

The shares slid 10 percent to 14.17 pesos at the close in Mexico City, the biggest decline since April 2008. The drop dragged down the benchmark IPC index, which fell 1.7 percent because Slim’s carrier makes up almost a fifth of its weight.