10. Liliane Bettencourt ($30 billion)(01 of10)
Open Image ModalLiliane Bettencourt attends the Giorgio Armani Prive Haute-Couture Spring / Summer 2012 show as part of Paris Fashion Week at Grand Palais on January 24, 2012 in Paris, France. (Photo by Pascal Le Segretain/Getty Images) (credit:Getty Images)
9. David Koch ($31 billion)(02 of10)
Open Image ModalAnniversary Chairmen Julia and David Koch at the Southampton Hospital 45th annual summer benefit, 'The Sapphire Ball' August 2, 2003 in Southampton, New York. The annual event serves as a major source of charitible revenue for Southampton Hospital's Department of Emergency Medicine. (Photo By Steven Henry/Getty Images) (credit:Getty Images)
8. Charles Koch ($31 billion)(03 of10)
Open Image ModalIn this February 26, 2007 file photograph, Charles Koch, head of Koch Industries, talks passionately about his new book on Market Based Management. (Bo Rader/Wichita Eagle/MCT via Getty Images) (credit:Getty Images)
7. Li Ka-shing ($32 billion)(04 of10)
Open Image ModalLi Ka-shing, chairman of Hutchison Whampoa Ltd. and Cheung Kong Holdings Ltd., attends the press conference of the 2011 Interim Results Announcement on August 4, 2011 in Hong Kong, China. (Photo by ChinaFotoPress/Getty Images) (credit:Getty Images)
6. Larry Ellison ($43 billion)(05 of10)
Open Image ModalOracle CEO Larry Ellison delivers a keynote address during the 2012 Oracle Open World conference on September 30, 2012 in San Francisco, California. (Photo by Justin Sullivan/Getty Images) (credit:Getty Images)
5. Bernard Arnault ($51 billion)(06 of10)
Open Image ModalBernard Arnault, Chairman and CEO of LVMH, Moet Hennessy Louis Vuitton, the Paris-based luxury goods empire, poses during the presentation of the 2012 year results, in Paris, Thursday, Jan. 31, 2013 . (AP Photo/Francois Mori) (credit:AP)
4. Bill Gates ($54 billion)(07 of10)
Open Image ModalBill Gates, chairman of Microsoft, during an interview January 30, 2013 in New York on the day he launches his 'annual letter' from the Bill and Melinda Gates Foundation. (STAN HONDA/AFP/Getty Images) (credit:Getty Images)
3. Amancio Ortega ($55 billion)(08 of10)
Open Image ModalAmancio Ortega and Marta Ortega Perez attend the Special Invitational 1m25 practice at Monaco International Jumping as part of Global Champion Tour on June 28, 2012 in Monte-Carlo, Monaco. (Photo by Didier Baverel/WireImage) (credit:Getty Images)
2. Warren Buffett ($58 billion)(09 of10)
Open Image ModalWarren Buffett, chairman and CEO, Berkshire Hathaway, Inc., arrives at the Allen & Company Sun Valley Conference in Sun Valley, Idaho, Friday, July 13, 2012. (AP Photo/Paul Sakuma, File) (credit:AP)
1. Carlos Slim ($66 billion)(10 of10)
Open Image ModalMexican telecommunications tycoon Carlos Slim speaks during news conference at the Soumaya museum in Mexico City,Monday, Jan. 14, 2013. (AP Photo/Dario Lopez-Mills) (credit:AP)