In a post on the social media platform he owns, Elon Musk recently lamented: “Whoever said ‘money can’t buy happiness’ really knew what they were talking about.” Now the world’s richest person can put that maxim to an even bigger test as he adds a new title: World’s first trillionaire. Read: SpaceX IPO raises $75bn in biggest debut ever Shares of SpaceX rose 19% Friday to $160.95 each in their first day of trading, vaulting the value of the rocket and AI company Musk founded to $2.2 trillion.