how to calculate net profit before tax According to this model, the interest rate decision depends on the supply of savings and investment needs, money supply, money demand, four factors, cause a change in the saving investment, money supply and demand factors will affect the level of interest rates. This theory is characterized by general equilibrium analysis. 1. Ordinary transport vehicles The value contains human consciousness and the double development of life, including the unity of human and external nature. All the development of the self - world is of value. The core essence of value is the free man, and the man who creates himself is the free man. Man is the ultimate object of value, man is the value ontology, man's behavior is the source of value, and the development of man is the result of value. The development of human beings is the unity of human's inner contradictions and external contradictions. It is the overall development of human consciousness and human life and the whole development of human and nature. That is, the self-creation of man and the unity of external creation and creation of nature, and the creation of this freedom is also the value behavior, so the whole value is the realization of freedom A broad market is a group of vendors and individuals who are associated with other vendors and individuals to buy and sell certain goods. The size of the market, the size of the market, is the number of buyers. Data released by the American petroleum institute (API) showed that U.S. crude oil inventories fell 5.2 million barrels in the week ended Dec. 15, down from an expected 35.18 million barrels. Refinery inventories fell more than expected, while gasoline inventories rose, but were less than expected. The overall API data is good and good for oil prices.