non profit mileage rate previously warned: "positions are too crowded to cause some pain." The market has its origins in ancient times when people used the term of place to trade in fixed time or place. In the present, the market has two meanings, one is the trading place, such as traditional market, stock market, futures market, etc., another meaning is the general term of trading activity. The word "market" refers not only to a trading venue but also to all transactions. So when it comes to market hours, it's not just about the size of the site, it's about whether the consumer activity is active. In a broad sense, all property rights transfer and exchange relationships can be market. Why? In the early 20th century, famous American economist elvin fisher developed the theory of economic gain. In its book "the nature of capital and yield", first, the concept of yield is analyzed in terms of the performance of earnings, and three different types of benefits are proposed: 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 Before that, what is the nature of the enterprise itself is an issue that has been ignored by traditional microeconomic theory. In the traditional microeconomic theory, is the manufacturer's production process as a "black box", namely enterprise is abstracted into a from input to output a "black box" of the pursuit of profit maximization.