Suppose that there is just one interest rate in the economy. in an attempt to prevent the economy from overheating, the Fed raises its interest rate target courseherosuppose that there is just one interest rate in the economy. in an attempt to prevent the economy from overheating, the Fed raises its interest rate target. illustrate graphically, using a diagram similar to figure 7 in this chapter, the effect on the money supply, interest rate, and GDP.