Given the ability of the CCP to significantly control major industries and movement of people, is it not possible that someone might buy an apartment in a "ghost city" while living in a rural area or renting in another city, expecting that people and jobs would flow to the city once it was completed?
Basically I don't really understand all the details, nuance and different corporate and governmental players involved in the "ghost city" phenomenon, but I'd almost expect that the government could make a "ghost city" into a "real city" in no time, by shutting down factories in one city and opening them there, or by changing internal migration restrictions.