You can build new towns, but they tend to have a chicken-and-egg problem with respect to jobs. No employers will set up shop in a new town because there are no

You can build new towns, but they tend to have a chicken-and-egg problem with respect to jobs. No employers will set up shop in a new town because there are no employees, people moving in get jobs in the nearest city because there are none suitable in town. These places are often called bedroom or commuter towns.