The roof is real. It is the concept of ownership that gives things value to the individual within the society that is none existent. In a way this is the real problem for every society. How well a society protects it's individual members determines how wealthy that society will be and is why knowledge of this particular fraud is discouraged. If everyone knew their would be a rush to get on welfare. Such a thing would cause the same problem for banks when their is a run on the stockpile of currency.