Here is Forbes ranking of the 20 richest people in the world:
* Carlos Slim (Mexico) - $53.5 billion, telecommunications
* Bill Gates (USA) - $53 billion, Microsoft
* Warren Buffett (USA) - $47 billion, Berkshire Hathaway
* Mukesh Ambani (India) - $29 billion, petrochemicals, oil and gas
* Lakshmi Mittal (India) - $28.7 billion, steel
* Larry Ellison (USA) - $28 billion, Oracle
* Bernard Arnault (France) - $27.5 billion, LVMH
* Eike Batista (Brazil) - $27 billion, mining, oil
* Amancio Ortega (Spain) - $25 billion, retail
* Karl Albrecht (Germany) - $23.5 billion, supermarkets
* Ingvar Kamprad & family (Sweden) - $23 billion, Ikea
* Christy Walton & family (USA) - $22.5 billion, Walmart
* Stefan Persson (Sweden) - $22.4 billion, Hennes & Mauritz
* Li Ka-shing (Hong Kong) - $21 billion, diversified
* Jim Walton (USA) - $20.7 billion, Walmart
* Alice Walton (USA) - $20.6 billion, Walmart
* Liliane Bettencourt (France) - $20 billion, L'Oreal
* S. Robson Walton (USA) - $19.8 billion, Walmart
* Prince Alwaleed Bin Talal Alsaud (Saudi Arabia) - $19.4 billion, investments
* David Thomson & family (Canada) - $19 billion, news and information
The full Forbes ranking of the world's billionaires can be seen at www.forbes.com/billionaires