The world’s two richest men are longtime business rivals, but now one of them has the ear of the next president of the United States.

A social media spat between Elon Musk and Jeff Bezos this week underscored a sharpening rivalry between two of the world’s richest men at a time when both are trying to grow their sprawling

Musk and Bezos — the richest and third-richest men in the world, who are both fixated on getting humanity off of it — have had a simmering rivalry for close to two decades now. But with Bezos’s Blue Origin and Musk’s SpaceX fighting for lucrative NASA contracts, the stakes have never been higher.