> If he's looking for mega-good, Musk would do significantly better to drop a full subway network. Agree, except that while many ridiculously wealthy people wo

> If he's looking for mega-good, Musk would do significantly better to drop a full subway network. Agree, except that while many ridiculously wealthy people would be willing to help pay for private access to some tunnels — _perhaps_ subsidizing a system that is later available to others — many fewer wealthy people would help pay for a subway.