Thanks for your efforts.
Rents are proportionately expensive in Silicon Valley versus Memphis.
The result is that salaries also are higher in Silicon Valley. After all, people try to demand an income that helps them live comfortably. It would be heavily weighted by things like cost of shelter, food etc. which are locally influenced. Then, before coming out with the Fed. This is a practical way to remove the effect of high living expenses on our incomes and income taxes.