At some point in 2026, headlines started declaring Elon Musk the world's first trillionaire. Then, a few weeks later, other headlines said he'd slipped back below that mark. Then he crossed it again. If you found this whiplash confusing, you're not alone - and honestly, the confusion says more about how "net worth" actually works than it does about Musk specifically. Let's unpack what's actually going on, because it's a genuinely useful lesson in how wealth at this scale is measured, and why it's nothing like the number sitting in your own bank account.