Kinda and sometimes. In this case most of Musk's growth in net worth was from a private valuation of SpaceX shares. They don't trade on the open market, so it w

Kinda and sometimes. In this case most of Musk's growth in net worth was from a private valuation of SpaceX shares. They don't trade on the open market, so it would be harder to actually turn those to cash. To OP's credit, nobody is arguing Musk is broke. But having a higher net worth suddenly overnight doesn't often correlate to a change in purchasing power.