Exchange Rate Determination in Mundell Fleming Model Quiz

The Mundell Fleming Model extends the IS-LM framework to an open economy by adding the exchange rate as a key variable. It analyzes the relationship between the goods market, the money market, and the balance of payments. By tracking how output, interest rates, and exchange rates interact, the model predicts how a nation responds to various international economic shocks.

The answer is True. This model is a short run macroeconomic framework, meaning it operates under the assumption that prices do not change immediately. Because prices are sticky, adjustments to economic shocks must occur through changes in output and exchange rates rather than through the price level. This makes the model particularly useful for analyzing immediate policy impacts in a floating regime.

The model typically assumes a small open economy where the domestic interest rate is determined by the world interest rate due to perfect capital mobility. In this environment, any deviation from the global interest rate triggers massive capital flows. These flows then force the exchange rate to adjust until the domestic market returns to equilibrium with the rest of the world.

Expansionary fiscal policy, such as increased government spending, shifts the IS curve to the right, putting upward pressure on domestic interest rates. Because capital is perfectly mobile, foreign investors flood the country to capture higher returns. This surge in demand for the local currency causes it to appreciate, which eventually reduces net exports and offsets the initial stimulus.

The answer is False. In a floating regime with perfect capital mobility, fiscal policy experiences complete crowding out through the exchange rate. As the currency appreciates due to capital inflows, domestic exports become more expensive and imports cheaper. This drop in net exports exactly cancels out the increase in government spending, leaving total national output unchanged in the end.

When the central bank increases the money supply, domestic interest rates fall below the world rate. Capital quickly flows out of the country as investors seek better returns elsewhere. This increase in the supply of the local currency on the global market leads to depreciation. A weaker currency makes exports more competitive, which stimulates demand and successfully increases the total national output.

The equilibrium is found where the IS curve representing goods, the LM curve representing money, and the BP or CM curve representing the balance of payments all intersect. In a floating system with perfect capital mobility, the BP curve is a horizontal line at the world interest rate. The intersection of these lines determines the unique level of output and the prevailing exchange rate.

If the world interest rate falls, the domestic rate becomes relatively more attractive. Capital flows into the small open economy, increasing the demand for its currency. Under a floating regime, this results in an immediate appreciation. The stronger currency then reduces net exports, shifting the IS curve until the domestic interest rate matches the new, lower global interest rate level.

The answer is True. Because monetary policy works through the exchange rate to boost net exports, it can successfully shift the level of national output. Unlike fiscal policy, which is neutralized by currency appreciation, monetary policy triggers a depreciation that makes a country's goods more attractive globally. This mechanism allows the central bank to influence the real economy effectively under market driven rates.

An increase in foreign demand for exports shifts the IS curve to the right as total spending on domestic goods rises. This puts upward pressure on the interest rate, attracting foreign capital. In a floating system, this leads to currency appreciation. The appreciation continues until the cost of domestic goods rises enough to offset the initial increase in demand, returning the system to equilibrium.

The LM curve shifts whenever there is a change in the real money supply. This can happen if the central bank intentionally alters the nominal money supply or if there is a change in the price level. Since the model assumes sticky prices in the short run, the primary driver of LM shifts is the deliberate action taken by monetary authorities to manage the nations liquidity.

The answer is True. This concept is known as the Impossible Trinity or the Trilemma. A nation must choose two of the three. If a country chooses a floating regime and free capital mobility, it gains the ability to conduct an independent monetary policy. The model demonstrates that trying to maintain all three simultaneously leads to uncontrollable market pressures that eventually force the system to break.

A decrease in investment shifts the IS curve left, lowering the interest rate. Capital flows out, causing the currency to depreciate. This depreciation makes exports cheaper and imports more expensive, boosting net exports. This increase in trade compensates for the lower investment, moving the IS curve back to its original position and keeping output stable at the world interest rate.

A horizontal BP curve at the level of the world interest rate represents perfect capital mobility. It signifies that any amount of capital will flow into or out of the country if the domestic interest rate differs even slightly from the global rate. This assumption is a cornerstone of the model for small open economies, as it dictates how the exchange rate must adjust to maintain balance.

The answer is True. When a currency depreciates, domestic goods become less expensive for foreign buyers, and foreign goods become more expensive for locals. This leads to an increase in net exports, which is a component of total demand. Consequently, the IS curve shifts to the right, reflecting the higher level of planned spending on domestic production at any given interest rate.