Why do developers have to build houses?

The house price is so high, it is really high, much higher than Gaojiazhuang. So who is the driving force behind high housing prices? Of course, local governments and developers, one selling land and the other selling buildings. Is it reasonable that a house must be built by a developer? Is it reasonable for developers to make money? In the past, units built houses and distributed them to employees. Later, employees raised funds to build houses. Later, some people said that houses should be commercialized, so they became developers and fat real estate tycoons. Some are fatter than pigs and hum than pigs. It is illegal for units and individuals to build houses. I don't know who made this law. If the government comes forward to create a real estate development company, can't it? If ordinary people want to buy a house, they will give the money to this company, which is safe and secure and will not be cheated. The government will organize a construction team, which will solve many people's employment and the wages of migrant workers will not be delayed. If they build a house, they will sell it to ordinary people at the cost price, so that they can live and work in peace and harmony, instead of drinking the blood of ordinary people. Is it really difficult for the government to organize a real estate company? Actually, it's not difficult at all. How do developers build houses? It's just subcontracting at different levels and finding several construction teams. What is the cost of the house price? No one has ever understood that there are tens of thousands per square meter. How many bags of cement and steel bars are only a few dollars? When the house was built, ordinary people couldn't afford it, and the rich people turned the house upside down, raising the house price and profiting from it. It's the peak of Spring Festival travel rush. If someone sells train tickets in public, it is a crime. The public security bureau will crack down severely, and if it is serious, they will go to jail. How much can they earn by selling train tickets? The resale of the house is reasonable and legal. How much can I earn by reselling the house? Why is it legal to resell houses? I really don't understand! Why are all the houses built by developers? Who can answer?