A billionaire is a person with a net worth of at least one billion units of a given currency, usually of a major currency such as the United States dollar, euro, or pound sterling. 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.[1] The American oil magnate John D. Rockefeller became the world's first confirmed U.S. dollar billionaire in 1916.[2]
As of 2018,[update] there are over 2,200 U.S. dollar billionaires worldwide, with a combined wealth of over US$9.1 trillion,[3] up from US$7.67 trillion in 2017.[4][5] According to a 2017 Oxfam report, the top eight richest billionaires own as much combined wealth as the "bottom half of the human race".[6][7] As of 2021, eight people have reached the status of USD centibillionaires, meaning that each has had a net worth of at least $100 billion.[8]
guardian
was invoked but never defined (see the help page).