Elon Musk is now the world’s richest man after he leapfrogged Amazon founder Jeff Bezos.

The reason for the change in top man is all down to the performance of Tesla’s stock, with Musk now reportedly worth a cool $188 billion.

You probably shouldn’t feel too bad for Bezos, though. He’s still sitting pretty with a personal wealth of around $187 billion.

But the rivalry between Musk and Bezos is about more than money, with The Verge noting that the pair have often found themselves competing against each other – often in weird ways.

Bezos was reportedly so envious of Musk’s success in securing a $1.3 billion incentive package for Tesla’s Gigafactory in Nevada that it served as the genesis for Amazon’s beauty pageant-style search for its second headquarters. Bezos has a spaceflight company in Blue Origin much like Musk does with SpaceX. The two men have traded barbs about their rockets and even fought over hallowed NASA real estate. (SpaceX won that fight and is the only of the two companies to successfully reach orbit.)

Musk only replaced Microsoft co-founder Bill Gates as the second-richest on the planet in November of last year, but again, it’s the performance of Tesla’s stock that has seen Musk become the richest person on the planet. Turns out there might be something to those electric cars after all.

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