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

Writing on the Wall These days, it feels like everyone's trying to figure out how long Elon Musk and Donald Trump's new bromance could possibly last, and an answer has just started to materialize: not much longer.

Elon Musk reignited a public dispute with fellow billionaire and space-industry rival Jeff Bezos, saying the Amazon.com founder had said President-elect Donald Trump would lose the election and that people should sell stock tied to Musk.