According to Bloomberg calculations, the top 10 richest people in the world are split between old-money inheritors and new-money entrepreneurs. A few of the world's 100 richest people have the same last name.
1. BILL GATES
Net worth: $86.6 billion. The cofounder and chairman of Microsoft remains the richest man on Earth. About 80 percent of his fortune is held in Cascade Investment.
2. CARLOS SLIM
Net worth: $71.3 billion. The Mexican tycoon and investor owns América Móvil, the largest mobile-phone carrier in the Americas.
3. WARREN BUFFETT
Net worth: $70.1 billion. In addition to being an extremely successful investor, Buffett is the chairman and CEO of Berkshire Hathaway.
4. AMANCIO ORTEGA
Net worth: $67.6 billion. The founding chairman of retailer giant Inditex owns 59 percent of the fashion group.
5 and 6. THE KOCH BROTHERS
Net worth: $51.3 billion. Charles Koch and David Koch tie, with over 51 billion dollars each. Charles (chairman and CEO) and David (executive vice president) control Koch Industries, an oil firm started by their entrepreneurial father, Fred Koch.
7. LARRY ELLISON
Net worth: $46.9 billion. Ellison is cofounder and CEO of Oracle, the world's largest enterprise software company.
8. INGVAR KAMPRAD
Net worth: $42.7 billion. Kamprad founded Ikea as a 17-year-old, and today controls what has become the world's largest furniture retailer.
9. CHRISTY WALTON
Net worth: $40 billion. The widow of John T. Walton, son of Wal-Mart founder Sam Walton, inherited her husband's $15.7 billion fortune, becoming the world's richest female.
10. JEFF BEZOS
Net worth: $40 billion. Bezos is the chairman and largest shareholder of the world's biggest online retailer, Amazon.