Is it wrong to be super-rich? There are more billionaires in the world than ever before — and now one trillionaire. But some think their existence is a sign of societal rot.
Musk named world’s first trillionaire
Leagues ahead: Musk has a vastly more wealth than even the world's second richest man. Glossary
Elon Musk - A South African-born entrepreneur whose companies have included the online payment service PayPal. He now controls Twitter, renamed 'X'.
PayPal - An online payments company.
Shares - A tiny unit of ownership of a company which is available to purchase.
Stock Market - A series of exchanges where shares in public companies are issued, bought and sold.
Shareholder - Someone who owns shares in a company. Owning a share means somebody owns a very small part of the company.
GDP - Short for Gross Domestic Product, the measure of all the goods and services produced inside a country.
Democracy - A system of government based on the idea of rule by the people.
Oligarchy - A system of government in which a small elite rules.