A billionaire, in countries that use the short scale number naming system, is a person who has a net worth of at least one billion (1,000,000,000) units of a given currency, usually the United States dollar, the euro, or the pound sterling. Forbes magazine updates a complete global list of known U.S. dollar billionaires every year.

Read more about Billionaire:  Current U.S. Dollar Billionaires, Long Scale Billionaires/short Scale Trillionaires, Statistics

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Billionaire - Statistics
... The table below lists numerous statistics relating to billionaires, including the net worth of the world's wealthiest individuals since 2007 ... Data is from the Forbes list of billionaires, with currency figures given in U.S ... Year Total number of billionaires Combined wealth of known billionaires Number of U.S ...