Excuse me, which companies in the A shares of Shanghai Stock Exchange are monopoly enterprises?

The monopoly enterprises in the A shares of Shanghai Stock Exchange are as follows:

China Petroleum

China Shipping

Guodian Power

Aerospace Communication

Dongfang Electric

A monopoly enterprise, as its name implies, is an industry that enjoys the policies given by the state, thus controlling social production, manipulating and monopolizing the market. At present, there are some monopoly industries, such as salt, tobacco, power supply and finance. These industries still have the flavor of planned economy. They operate exclusively, and ordinary people can't live without it. Products are the only choice. Therefore, it is also called overlord industry. The products of these industries are the girls of the emperor's family and don't worry about marrying. No matter in theoretical analysis or social reality, the monopoly of public enterprises has caused many disadvantages. Therefore, introducing competition mechanism into public utilities and breaking the monopoly of public utilities have become the content of reform in many countries. In the process of building and perfecting the socialist market economy, China's legislative and administrative departments have also taken measures to regulate the monopoly behavior of public enterprises. Combined with China's national conditions, the anti-monopoly regulation of domestic public enterprises should focus on the following aspects: price supervision, ensuring interconnection, and prohibiting cross-subsidies.