Elon Musk responded to a viral X post on June 14, 2026, suggesting that becoming humanity's first quadrillionaire is "not impossible" but would require manufacturing facilities on the Moon and Mars. The comment came just three days after Musk became the world's first trillionaire following SpaceX's record-breaking IPO, which closed at a valuation of over $2 trillion on June 12. Musk added that by the time such wealth becomes achievable, traditional currencies may be obsolete: "I don't think dollars will be used as currency. Just mass and energy." The remark came in reply to a World of Statistics post noting that Musk would need another $998.9 trillion to reach the quadrillionaire milestone of $1,000,000,000,000,000. For context, one quadrillion dollars exceeds the entire global GDP and is roughly 70 times the US national debt. Musk's vision relies on Moon City development, lunar factories, and orbital data centers — all dependent on SpaceX's Starship achieving full reusability, which r...