Mexican billionaire Carlos Slim looks on before he gives a speech at Mexico's school of engineers during an event to mark the 50th anniversary of his engineering degree, in Mexico City

Reuters
Mexican billionaire Carlos Slim looks on before he gives a speech at Mexico's school of engineers during an event to mark the 50th anniversary of his engineering degree, in Mexico City
Mexican billionaire Carlos Slim looks on before he gives a speech at Mexico's school of engineers during an event to mark the 50th anniversary of his engineering degree, in Mexico City May 28, 2013.REUTERS/Henry Romero
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