The investment quantity is the decreasing function of interest rate, saving is the increment function of interest rate, and the change of interest rate depends on the equilibrium point of investment quantity and saving amount. Keynes's theory of money supply and demand decided that interest rates were a monetary factor rather than an actual factor. The general value form, while the general value form is not equal to the local value form. The practice of value must be determined in a certain category. Hybrid car In his theory, money supply is controlled by the central bank and is an exogenous variable with no interest rate elasticity. At this point, monetary demand depends on people's psychological "liquidity preference". “We’re very proud of the way that the glass industry has come together to face the challenge of energy efficiency and decarbonisation - which will continue to define all manufacturing and markets for the coming decades. In economic terms, the benefits of holding any two currencies should be equal in the equilibrium of the foreign exchange market, which is: Ri=Rj (interest rate parity). Here, R stands for yield, and I and j represent currencies of different countries. If the benefits of holding two currencies are unequal, you will have A arbitrage: buy A kind of foreign exchange and sell B foreign exchange. Although a lot of people have taunted on her tall and skinny stature, but Ana Ward's figure is an advantage in the modeling world. In fact, the impossibly thin and freaky-looking girl has entered the Cycle 15 of America's Next Top Model. After defeating 22-year-old Chelsea Hersley for being the newest "Top Model", Ann said, “I\'m so honored at this time. All those testamonials are about being too tall or just being not normal”.