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. [1] 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. It's easy to figure out that businesses typically exploit human resources to acquire increasing profits. /Salary deduction, overwork without pay and refusal to award promotion are perceived as normal things in the majority of companies, which overly stretch the labor force at the expense of personnel loss. /The advertising agency provides the relevant example to clarify the point. The account executive is responsible for the communication between the clients and designer, who undertakes the critical duty. However, the persons on the position works overnight but get the minimum wage above the bottom line of society. Therefore, the rate of labor loss in advertising industry marks high notoriously. Overusing human resources definitely means the sacrifice of employee's loyalty. But even at its lowest point, interest rates were just 0.18 percentage points higher, not a quarter-point rise in interest rates.