It's a cyclical problem: There are no jobs worth moving for in most of the middle of the country, which means no one wants to move there, which means that there

It's a cyclical problem: There are no jobs worth moving for in most of the middle of the country, which means no one wants to move there, which means that there's no workforce for big companies, which means there's no jobs worth moving for. Likewise for social scenes, services, etc., It's the same feedback loop that makes the existing big cities attractive. Good jobs bring people with skills and money, which support services and provide a labor pool for companies that want to hire, which provides a glut of good jobs.