The top 50 wealthiest people in the world have a combined fortune of US$1.45 trillion (S$2.08 trillion), nearly equal to the GDP of Australia, according to Wealth-X and Business Insider.
The United States is home to 29 billionaires on the list, more than any other country, and only four billionaires from China and two from Hong Kong made the top 50.
As with previous billionaire rankings, most billionaires are from the technology sector. Facebook co-founder Mark Zuckerberg is the youngest at age 31, and ranks eighth with a net worth of US$42.8 billion.
The oldest billionaire is 93-year-old L'Oreal heiress Liliane Bettencourt, who is ranked 17th with a net worth of US$29 billion, and is one of just four women in the list.
Here are the 50 richest people in the world right now: