Most of the developed land is set aside at night. The Utilization idea introduces Dual Economies where 50% of citizens live and work at night time, and the other 50% remain current status.
The notion is a revolutionary model that changes how humans live. While some overpopulated cities have limited land but a massive population, with the idea of sharing economy, Dual Economies help to utilize the land at night for businesses to run.
It is not only a solution to crowdedness but also to maximize the gross production of one place by putting all land available in use.