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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