Why did yu 'ebao decline? Canning's 1929 book, economics in accounting, cites the economist's view that asset values are determined by the present value of the future cash flows of assets. The proposed acquisition of calcium chloride will improve the self-balancing ability of chlorine and alkali and guarantee the stability of industrial chain 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: Value is the core concept that defines the existence of human beings. It is the essence of human existence and development. All human emancipation behavior, namely the essential rule (humanity) for the creation of the self and to create and eventually reached for the essence of the law in order to maintain and development of a simple statement is all human practice is for maintaining and developing the essence of self, all value form from the category, cannot be separated from this category. Values in many areas have specific forms, such as social value, personal value, economic value, legal value, etc. The existence of these values is the essential nature of the category of human beings in different fields. At the same time, because there are some conceptualized maintenance and development of human thought there is no actual physical force, such value is defined separately as nominal value. Another element of the market-tracking plan is determining the number of foreign exchange futures markets to track and the number of transactions to be traded within a certain period of time.