The ranking of the world's 20 richest people as estimated by Forbes magazine. Listings include rank, name, home country or state, age where known, wealth in billions of dollars and source of the money.

    1. William Gates III, Washington, 49, $46.5, Microsoft

    2. Warren Buffett, Nebraska, 74, $44, Berkshire Hathaway

    3. Lakshmi Mittal, India, 54, $25, steel

    4. Carlos Slim Helu, Mexico, 65, $23.8, telecom

    5. Prince Alwaleed Bin Talal Alsaud, Saudi Arabia, 48, $23.7, investments

    6. Ingvar Kamprad, Sweden, 78, $23, Ikea

    7. Paul Allen, Washington, 52, $21, Microsoft, investments

    8. Karl Albrecht, Germany, 85, $18.5, supermarkets

    9. Lawrence Ellison, California, 60, $18.4, Oracle

    10. S. Robson Walton, Arkansas, 61, $18.3, Wal-Mart

    11. Jim Walton, Arkansas, 57, $18.2, Wal-Mart

    12. John Walton, Arkansas, 59, $18.2, Wal-Mart

    13. Alice Walton, Texas, 56, $18, Wal-Mart

    14. Helen Walton, Arkansas, 85, $18, Wal-Mart

    15. Kenneth Thomson and family, Canada, 81, $17.9, publishing

    16. Liliane Bettencourt, France, 82, $17.2, L'Oreal

    17. Bernard Arnault, France, 56, $17, LVMH

    18. Michael Dell, Texas, 40, $16, Dell

    19. Sheldon Adelson, Nevada, 71, $15.6, casinos, hotels

    20. Theo Albrecht, Germany, 83, $15.5, supermarkets

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    (Agencies)