[bsder]

And also births.

The big issue with the migration differential is that it is expensive to move into California while it is relatively cheap to move out.

So, you need a job and you have to save money to eat the differential (rent increase, security deposits, car registration) if you want to move into the state.

Selling your house in most other states barely gets you a down payment on a house in California.

On the other hand, Californians selling their houses and then paying cash to buy another house in Texas, Oregon, etc. is sufficiently common that most of such places have derogatory terms for it.