mayer brown profits per partner People in the choice is to hold their currencies, or hold a certain foreign borrowing money, the first and want to hold what kind of currency brought him great benefits. And the yield of currencies first is measured by its financial market interest rates. The market in the narrow sense is the place where buyers and sellers exchange goods. Interest rate, in the form of expression, refers to the ratio of the amount of interest to the total amount of borrowed capital in a certain period of time.  the interest rate is the interest level per unit time of the unit currency, indicating the interest rate. Economists have been looking for a theory that can fully explain the structure and change of interest rates. Interest rates are usually controlled by the central bank of the country and administered by the federal reserve board in the United States. Today, interest rates are one of the important tools for macroeconomic regulation.