Which career did Carlos "Slim" Helu focus on immediately after graduating from University in 1961?

Carlos Slim Helú is a Mexican business magnate, investor, and philanthropist. From 2010 to 2013, Slim was ranked as the richest person in the world by the Forbes business magazine.

After graduating from university in 1961, Slim launched his business career by starting off as a stock trader in Mexico, often working 14-hour days to make a name for himself in the Mexican business world.