Trends on mobility of people have changed a lot post-pandemic. I wouldn't put much faith in any data from before 2021. By the way, in 2018, the NIMBYs were st

Trends on mobility of people have changed a lot post-pandemic. I wouldn't put much faith in any data from before 2021. By the way, in 2018, the NIMBYs were still getting their way, so that isn't exactly relevant to the current discussion. At the time, CA was importing a middle class from abroad and losing poor residents. Currently, the importation of that middle class has slowed down a lot, and the existing middle class appears to be moving away. Supposedly, the lower-income bracket also isn't moving around as much because it's harder. You aren't going to get a decade-long analytical post-mortem of this trend until... about 2031. The news stories are what we have, and their underlying data (which you can probably find in FRED if you search enough). Also, I don't know what you consider "very wealthy," but if the line is "people for whom total tax burden in CA is higher than total tax burden in TX," your definition of "very wealthy" is at a much lower income than most people will think - the break-even point is less than $100k of income for many people.