1. Bill Gates, (U.S.A.)
Net worth: $79.2 billion
Source of wealth: Technology company Microsoft
2. Carlos Slim Helu, Mexico)
Net worth: $77.1 billion
Source of wealth: Telecommunications
3. Warren Buffett, (U.S.A.)
Net worth: $72.7 billion
Source of wealth: Investment holding company Berkshire Hathaway
Nationality: American
4. Amancio Ortega, (Spain)
Net worth: $64.5 billion
Source of wealth: Retail chain Zara
Nationality: Spanish
5. Larry Ellison, (U.S.A.)
Net worth: $54.3 billion
Source of wealth: Technology company Oracle
Nationality: American
6. Charles Koch, (U.S.A.)
Net worth: $42.9 billion
Source of wealth: Conglomerate Koch Industries
Nationality: American
6. David Koch, (U.S.A.)
Net worth: $42.9 billion
Source of wealth: Conglomerate Koch Industries
Nationality: American
8. Christy Walton, (U.S.A.)
Net worth: $41.7 billion
Source of wealth: Retailer Wal-Mart Stores
Nationality: American
9. Jim Walton, (U.S.A.)
Net worth: $40.6 billion
Source of wealth: Retailer Wal-Mart Stores
Nationality: American
10. Liliane Bettencourt, (France)
Net worth: $40.1 billion
Source of wealth: Cosmetics company L’Oreal
Source: Forbes.com
Photo by Thomas Hawk