Elon Musk is set to become the world's first trillionaire as SpaceX finally hits the US stock market. 

Max Rashbrooke, senior research fellow of economic inequality at Victoria University of Wellington told Andrew Dickens, "we live in a world where a lot of people have got nothing or they're may be worth a dollar and it's sort of hard to think that someone is 1 trillion times more worthy or has contributed 1 trillion times more to humanity than someone else.

"So, I find it very hard to justify."

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