In order to maintain a fixed exchange rate: O a country must constantly decrease its money supply. O a country cannot change its money supply. O a country must constantly increase its money supply. O Maintaining a fixed exchange rate is unrelated to the money supply.When interest rates in the U5. decrease, we can expect NCO to: 0 decrease, because capital inow is decreasing. 0 decrease, because capital inow is increasing. 0 increase, because capital inow is increasing. 0 increase, because capital inow is decreasing