Ghost cities also keep construction workers employed.
Don't you see why this is obviously disastrous? There are so many analogies that can be drawn -- that I'm not even going to try. If you don't see why this is obviously ridiculous then read some stuff about the invisible hand of the market (http://en.wikipedia.org/wiki/Invisible_hand). It is only a valid point from the narrow perspective of the workers involved and the employers of those workers selling their services.
Its called "political reality".
But yeah, I read about the theory you linked to, about 10 years ago, when I studied it.