In countries that use the short scale number naming system, a billionaire is a person who has a net worth of at least one billion units of a currency, usually the US Dollar, Euro or the Pound Sterling. Forbes Magazine updates a complete list of US Dollar billionaires around the world every year. There were 793 officially known short scale billionaires in the world as of 2009[1].
In countries that use the long scale number naming system, a billionaire is someone who has at least a million times a million units of currency. There are no billionaires under the long scale number naming system.
Under the short scale number naming system, a trillionaire would be a person who has at least a thousand billion units of currency. Under the long scale number naming system, a trillionaire would be a person who has at least a million billion units of currency. Even under the short scale number naming system there are no trillionaires.
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A billionaire is somebody who has at least one billion units of currency (for example, British pounds £ or American dollars $). It is not clear how much a billion is. In Europe a billion is one million million (1,000,000,000,000) with 12 zeros. However, in the United States a billion is one thousand million (1,000,000,000) with 9 zeros. Some people in the United Kingdom, especially banks, also use the American way.
"Milliard" is used for 1,000,000,000 in countries that use one million million for billion.
   | Askoxford.com - AskOxford: How many is a billion? |
| | Foreignpolicy.com - Our Inequality Anxiety |
| | Forbes.com - Publishes the world's billionaires list annually - World's Billionaires - Forbes.com |
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