Investment principle
Investment studies how to allocate the limited resources of individuals and institutions to stocks, treasury bonds, real estate and other (financial) assets in order to obtain reasonable cash flow and risk/rate of return. Its core is to obtain the optimal equilibrium solution of personal wealth distribution under the guidance of utility maximization criterion. Universities have courses with the same name, and there are many versions of books.
fiscal science
Finance is an applied economics discipline, which mainly studies the theory, system and management methods of government departments in raising and using funds, and also studies the tax problems of enterprises in the process of production and operation.
Economic statistics
Economic statistics is an applied discipline of statistics in the economic field. It takes economic data as the research object, including the collection, generation and transmission of economic data, and analyzes the economic phenomena behind economic data and the laws of complex economic systems by statistical methods, thus serving economic and management decisions.