Assume that the average reserve ratio in the U.S. is 0.05 . If the Fed raises the minimum reserve requirement to 0.1 , what will happen to the money multiplier and the real interest rate? The money multiplier will increase, causing the real interest rate to decrease. The money multiplier will increase, causing the real interest rate to increase. The money multiplier will decrease, causing the real interest rate to increase. The money multiplier will decrease, causing the real interest rate to decrease.