If classical economists have interpreted the "market" as "laissez-faire", coase has answered the question of how to achieve "laissez-faire" or "price mechanism". In general, us interest rates fall and the dollar weakens. Us interest rates rise and dollar trends favour. A change in the price of U.S. Treasury bills, especially long-term Treasury bills, can help to predict the direction of the U.S. dollar. If investors think the us inflation is under the control, then under the existing Treasury bonds interest rate to attract, especially short-term Treasury bills, will attract investors, bond prices to rise. The evolution of human beings has been through the process of inorganic small molecule, organic small molecule, organic polymer, multi-molecular system, primitive life, low animal, high animal and so on. The value phenomenon is accompanied by the development of human beings, and it is important to understand the origin of value in order to understand the value in a comprehensive and profound way, and to eliminate the many controversies existing in the theoretical circle of value. Humans evolved from lower animals, and the value phenomenon is not born, nor is it produced overnight. It has its own origins and evolves with the evolution of human beings. Leakage may occur at the interface of the gasoline pipe, which leads to the use of the air conditioning system into the vehicle. If the owner found the car fumes, deal with gasoline pipeline - open interface to check engine hatch, it is easy to discern does the interface of gas leakage, for a period of time after the leakage surface will appear a layer of oil sludge. If the leakage of the gasoline pipe is found, the interface should be tightened or repaired. Further market analysis showed that he could make a small profit and lose money, and the time needed was long, so he decided to draw out the money as soon as possible for other deals. He's going to lose up to $1,000 on the pound. He was more concerned about how much he might lose than the pound. In the trade memo, he noted that if the price of a certain day in the city was not to the profit target, and not to "stop the loss point", the transaction would be closed.