Well that and your labor market power is maximized in places where there are many potential employers. If you put down roots in a one company town, they can jus

Well that and your labor market power is maximized in places where there are many potential employers. If you put down roots in a one company town, they can just tell you to go pound sand when you ask for a raise or promotion. Also, being in a place with lots of employers is a hedge against layoff risk.