This is really circular. Poorer places have cheaper cost of living. Part of the reason CA/NY have such high housing prices is that they have such high incomes.
It seems to me that everyone makes a tradeoff between earning potential and cost of living, which are usually in tension because a lot of the goods we care about are positional rival goods and a lot of earning potential is network effects.
You see people relocate to poorer areas when they are able to retain th…