Elon Musk has been part of the dozen-digit club since 2021. That same year, he became the first person ever to boast a net worth of over $300 billion (£223bn). And while his fortune has fluctuated wildly since then, it currently stands at an astronomical $839 billion (£624bn), with the Tesla and SpaceX boss, who aims to colonise Mars, expected to be the first person to achieve trillionaire status.

Musk's recent foray into politics proved highly controversial, fuelling concerns that some of the ultra-rich are buying their way oligarch-style into political power and influence.

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