Billionaire

A billionaire is a person whose net worth is at least one billion units of a given currency, typically USD. It is a sub-category of the concept of the ultra high-net-worth individual. The American business magazine Forbes produces a global list of known U.S. dollar billionaires every year and updates an internet version of this list in real time. The American oil magnate John D. Rockefeller became the world's first confirmed billionaire in 1916.