how to calculate total gross profit Understand different connotation of interest rates, will help us for the financial concepts of interest rates has a more deepen understanding, especially the formation, change and derivatives need to be determined by the market, this is a very key factor. The fund's managing director Christine Lagarde said Christine Lagarde, in June 2016, voted to leave the European Union has an impact, the British economic growth this year and in other parts of the world economic growth. The market can indeed be described as a laissez-faire pricing mechanism. However, this price mechanism does not operate in a vacuum, and does not work effectively in any social system. The basic premise of the efficient operation of the price mechanism is the implicit assumption of Smith: to recognize individual "lusts" and to clear and protect individual property rights. Clear and guaranteed personal property is the basic premise of market existence. It is necessary to recognize the personal "lusts" and to ensure that individual property rights are supported by the corresponding institutions, which are not in our society. The ECB confirmed that it plans to slow its bond-buying efforts to 30 billion euros (22 billion pounds) by the end of September 2018, from January 2018. In the latest "near-term energy outlook," the U.S. energy information administration (EIA) said that in November, conventional gasoline retail prices in the United States averaged $2.56 a gallon, up about 6 cents a gallon on a month-on-month basis. The data initially showed that crude prices were rising. Meanwhile, the U.S. energy information administration (EIA) forecasts that conventional gasoline retail prices in the U.S. will hit $2.59 a gallon this month, up 34 cents a gallon from the previous year. The U.S. energy information agency expects the average U.S. retail price to be at $2.51 a gallon by 2018.