The US citizen from the Midwest could move to California and make a startup; they aren't gated by having a job beforehand. On the other hand, if all the forei

The US citizen from the Midwest could move to California and make a startup; they aren't gated by having a job beforehand. On the other hand, if all the foreign talent congregates elsewhere, the Midwest kid will need a visa to compete with them. The non-zero sum is that having all the people in one place makes more opportunities than if they weren't together.