Some 70 percent, or 139 of the world's 200 richest people, created their own wealth, while the rest inherited much or all of it, Bloomberg reported on Tuesday.
Bloomberg released its annual list of the world's billionaires early this month.
Among the top 10 wealthiest people, nine made their own fortune, with Christy Walton ranking as the sole exception. The daughter-in-law of Wal-Mart founder Same Walton placed No. 9 on the global rich list with a net worth of US$36.4 billion.
Microsoft co-founder Bill Gates topped the list with a fortune of $74.8 billion, and Carlos Slim, CEO of Mexican telecommunications company Telmex, was No. 2 with $67.1 billion.
Amancio Ortega, the founder of Spanish fashion chain Zara, ranked third with $59.2 billion, followed by Berkshire Hathaway CEO Warren Buffett with $56.4 billion and Charles Koch, CEO of American oil company Koch Industries, with $49.1 billion.
Some 66 Americans made the list, the largest number among any country.
Samsung Electronics chairman Lee Gun-hee placed 108th with a net worth of 10.3 billion and Hyundai Motor Group chairman Chung Mong-koo was 194th with $6.5 billion. Both were classified as having inherited their wealth.