Elon Musk became the world's first trillionaire last week following SpaceX's record-breaking stock market debut and has now suggested that an even more extraordinary wealth milestone, a quadrillion dollars, is theoretically within reach, though it would require humanity to industrialise other planets first.
How Musk Became a Trillionaire
SpaceX listed on the Nasdaq under the ticker SPCX on June 13, selling 555.6 million shares at $135 each and raising $75 billion, the largest IPO in recorded history. Shares closed their first trading day at approximately $161, a 19 per cent gain, valuing the company at over $2.1 trillion. Forbes estimates the listing pushed Musk's net worth to approximately $1.1 trillion, making him the first individual in history to cross the trillion-dollar threshold.
The Quadrillionaire Comment
The exchange began when an account called World of Statistics posted on X that Musk would need an additional $998.9 trillion to become a quadrillionaire. Musk replied: "Not impossible, but definitely requires factories on the Moon and Mars to achieve. By then, I don't think dollars will be used as currency. Just mass and energy."
The remark is consistent with positions Musk has held publicly for years, framing his wealth not as personal accumulation but as a byproduct of building planetary-scale infrastructure. He has previously referenced the concept of a Kardashev II civilisation, a theoretical stage where a species can harness energy at stellar scale, as the context in which such figures would even be meaningful.
To Put a Quadrillion in Perspective
A quadrillion dollars is $1,000 trillion, approximately 11 times the current GDP of the entire United States, or roughly equal to the combined economic output of every country on Earth for nearly a decade. Analysts note that if such wealth were divided equally among the global population, every person alive would receive enough for a new electric vehicle, a housing down payment, and decades of living expenses.
There is no credible financial model that places a quadrillion-dollar personal fortune within reach under any current economic system, a point Musk himself acknowledged by saying the dollar likely would not even exist as a currency at that stage.
