Mainly caused by monopoly. Compared with the international oil price, the domestic oil price can't keep up. The key lies in the monopoly nature of PetroChina and Sinopec. PetroChina and Sinopec are originally a company, similar to Mobil in the United States. In order to prevent monopoly, they are divided into two parts, one is engaged in oil production and the other is engaged in oil refining. This drawback comes out. Oil production is always based on international crude oil futures, and oil is sold to refiners at high prices. The refinery is only called a loss every day, and a loss will be subsidized.

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