c) In the Mundell-Fleming model with a fixed exchange rate, what happens to aggregate income, the exchange rate, and the trade balance when the world interest rate rises? The figure below shows the effect of an increase in the world interest rate if exchange rates are fixed. Both the IS* and LM* curves shift. As in part (b), the IS* curve shifts to the left since the higher interest rate causes investment demand to fall. The LM* schedule, however, shifts to the left instead of to the right. This is because the downward pressure on the exchange rate causes the central bank to buy dollars and sell foreign exchange. This reduces the supply of money M and shifts the LM* schedule to the left. The LM* curve must shift all the way back to LM*2 in the figure, where the fixed exchange-rate line crosses the new IS* curve.
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Problem Set 8 – Some Answers FE312 Fall 2010 Rahman Page 8 of 8 In equilibrium, output falls while the exchange rate remains unchanged. Since the exchange rate does not change, neither does the trade balance.
c) In the Mundell-Fleming model with a fixed exchange rate, what happens to aggregate income, the exchange rate, and the trade balance when the world interest rate rises? The figure below shows the effect of an increase in the world interest rate if exchange rates are fixed. Both the IS* and LM* curves shift. As in part (b), the IS* curve shifts to the left since the higher interest rate causes investment demand to fall. The LM* schedule, however, shifts to the left instead of to the right. This is because the downward pressure on the exchange rate causes the central bank to buy dollars and sell foreign exchange. This reduces the supply of money M and shifts the LM* schedule to the left. The LM* curve must shift all the way back to LM*2 in the figure, where the fixed exchange-rate line crosses the new IS* curve.Page 8Problem Set 8 – Some Answers FE312 Fall 2010 Rahman Page 8 of 8 In equilibrium, output falls while the exchange rate remains unchanged. Since the exchange rate does not change, neither does the trade balance.
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