Driving through Mexico City traffic takes courage. Although Carlos Slim Helú, the richest man in the world, is at the wheel of his navy blue Mercedes taking on the challenge. He is accompanied by a large convoy of private security following closely behind him. In spite of his $53.five billion fortune, the 71-year-old tycoon lives inside an unassuming six-bedroom house blocks from his office, and has no interest in flashy yachts or palatial houses around the globe. His pinstripe suit might be made by Brioni, the fine Italian tailors, but his wristwatch is  a quite ordinary-looking plain dial with a leather strap. His black leather loafers are shiny, but no more luxurious than any other stand up Mexican businessman.