The magazine estimates that Mr Slim, whose business interests range from telecommunications to construction, is worth $73bn.

 

He is followed by Microsoft founder² Bill Gates on $67bn.

 

Famed investor³ Warren Buffett has dropped back to fourth place, with third spot going to Amancio Ortega, the founder of the Zara fashion chain.

 

Record profits, and a resulting surge in the share price of the holding company Inditex that he owns, has propelled Mr Ortega from fifth place, leapfrogging Mr Buffett.

 

In contrast, the "Sage⁴ of Omaha" admitted last week that his Berkshire Hathaway investment company had a "sub-par" year in 2012, underperforming the S&P 500 index of US share prices for only the ninth time in its 48-year history.

 

Mr Buffett, 82, was one of seven over-70s in the 10 wealthiest people on the list, with the average age of the top 10 reaching 74 this year.

 

Besides Mr Ortega, another fast riser has been Larry Ellison, the Oracle⁵ tycoon, whose software firm has risen 20% on the stock market over the last year.

 

There have been mixed fortunes in the French luxuries sector⁶. Bernard Arnault, the man behind Louis Vuitton Moet Hennessey, saw his stock fall last year, dragging him down from fourth spot to 10th.

 

That put him one place behind 90-year-old L'Oreal heiress Liliane Bettencourt, whose estimated $30bn fortune has been put under the custody⁷ of her daughter after a long legal battle.

 

The two Koch Brothers, who own a giant US industrial conglomerate⁸ and have helped bankroll the radical⁹ right-wing Tea Party movement, came in joint¹⁰ sixth place, with $34bn apiece.

 

Li Ka-Shing has held onto the eighth position and remains¹¹ the highest-placed Asian, with $31bn. The Hong Kong-based owner of Hutchison Whampoa and Cheung Kong Holdings is the world's biggest operator of container terminals.

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