Historically, the concept of income has first appeared in economics. Adam Smith, in the wealth of nations, defined income as "the amount of consumption that is not eroded by capital", and saw it as an increase in wealth. Later, most economists inherited and developed this view. 1890, ai (Alfred Marshall Maarshell) in its "the principles of economics," the Adam Smith's "wealth increase" enterprise, introduced the concept of earnings, is proposed to distinguish the entity capital and value-added benefits of economic benefits. Suppose a speculator decides to enter the foreign exchange futures market. He is going to take out $10,000 to speculate. He selected the broker bank and registered representative, opened an account, and deposited the money. To be on the safe side, he decided to do sterling business first and then gain some experience before entering other markets. After Ziddu becomes its subsidiary, Longfin will provide financial services based on cryptocurrency through Ziddu. When the economy overheats and inflation rises, interest rates are raised and credit tightened. When the overheated economy and inflation are under control, the interest rate is duly lowered. Interest rates are therefore one of the fundamental economic factors. Interest rates are an important financial variable in economics, and almost all financial phenomena and financial assets have more or less connection with interest rates.