The only way for solving the problems of providing housing for the majority is to break down the monopoly by the developers while there is also rooms for government to give tax and charge rates on land and housing.

This paper discusses the problem of quality discrimination under single monopolistic manufacturer.

Firstly, we studied the method and characteristics of second-degree price discrimination that was enforced by monopoly enterprise on the basis of documents available.

Since network externalities maybe effect on the consumer s expect,monopoly firm s pricing strategy and profits,so it is important to a monopoly firm how to supply the consumer products in different stages and set a reasonable price in order to gain maximum profit when the products have the network externality character.