an example of a non profit organization The charity said it was shocked to find that around 85% of temporary staff suffered a pay deficit while working in the same job for more than three months. It said agency workers that stayed with one employer for more than three months were expected to have the same pay as full-time employees. Keynes argued that savings and investment were two interdependent variables, not two independent variables. With the development of social division of labor and market economy, the concept of market is also developing and deepening, and the multiple meanings of different levels are reflected in the deepening of the project. Fold development Refrigerant season price performance is good, overall profit is good Modern economy, the interest rate as the price of money, not only restricted by many factors in the economic and social, and changes in interest rates to have a great impact on the economy as a whole, as a result, modern economists are studying the interest rate decision problem, pay special attention to the relationship between the variables and the balance of the economy as a whole, the interest rate decision theory has experienced the classical interest rate theory, Keynes's interest theory, interest rate in loanable funds theory and is-lm analysis as well as the contemporary evolution of dynamic interest rate model, the development process.