AP Macroeconomics: Foreign Exchange Market Graphs (Supply and Demand for Currency)

AP Macroeconomics – Foreign Exchange Market Graphs (Supply and Demand for Currency)

AP Macroeconomics – Study Guide
Topic: Foreign?Exchange Market Graphs (Supply & Demand for Currency)

What This Is

The foreign?exchange (FX) market shows how the exchange rate of a nation’s currency is determined by the interaction of demand for and supply of that currency. On the AP exam you’ll be asked to draw the FX graph, explain why the curve shifts, and predict the effect on the exchange rate, trade balance, and domestic macro variables. Real?world example: When the European Central Bank raises euro?area interest rates, investors chase higher euro yields, causing the demand for euros to rise and the euro to appreciate against the dollar.

Key Terms & Formulas

• Foreign?Exchange Market (FX Market) – The global marketplace where currencies are bought and sold; graph axes: price (exchange rate) on the vertical axis, quantity of foreign currency on the horizontal axis.
• Nominal Exchange Rate (E) – The price of one unit of foreign currency in terms of domestic currency (e.g., E = $/€).
• Real Exchange Rate (RER) – RER = (E × P_domestic) / P_foreign; adjusts the nominal rate for price level differences, showing purchasing?power parity.
• Supply of Domestic Currency – The amount of home?currency that residents are willing to sell for foreign currency; upward?sloping because a higher exchange rate (more foreign currency per unit) makes selling domestic currency more attractive.
• Demand for Domestic Currency – The amount of home?currency that foreigners are willing to buy; downward?sloping because a higher exchange rate makes foreign goods relatively cheaper, reducing foreign demand for the domestic currency.
• Currency Appreciation – A rightward shift of the demand curve (or leftward shift of supply) that raises the exchange rate (more foreign currency per unit of domestic currency).
• Currency Depreciation – A rightward shift of the supply curve (or leftward shift of demand) that lowers the exchange rate.
• Interest?Rate Parity (IRP) – (1 + i_domestic) = (1 + i_foreign) × (E_expected / E); higher domestic interest rates increase demand for domestic currency.
• Balance?of?Payments (BoP) Effect – A current?account surplus (exports > imports) creates excess demand for domestic currency, shifting the demand curve right.
• Capital?Account Flow – Net foreign investment in domestic assets; a capital inflow raises demand for domestic currency, while a capital outflow raises supply.

Step?by?Step / Process Flow (Typical AP Problem)

1. Read the stimulus – Identify the policy or shock (e.g., “The Fed raises the federal funds rate” or “U.S. tourists increase travel to Europe”).
2. Determine the direction of the shift –
   Higher domestic interest rates-Demand for domestic currency ? (right shift).
   Higher foreign interest rates-Supply of domestic currency ? (right shift).
3. Draw the FX graph –
4. Vertical axis: E (domestic currency per foreign currency).
5. Horizontal axis: Quantity of foreign currency.
6. Plot the original Supply (S?) and Demand (D?) curves, label equilibrium E?, Q?.
7. Shift the appropriate curve, label new equilibrium E?, Q?.
8. State the new exchange?rate outcome – If demand shifts right, E? > E? (appreciation); if supply shifts right, E? < E? (depreciation).
9. Link to macro variables – Explain how the new rate affects net exports, AD, and possibly the unemployment gap (e.g., appreciation-cheaper imports-AD falls).

Common Mistakes

AP Exam Insights

1. Multiple?Choice Focus: Questions often give a short stimulus (e.g., “U.S. investors buy more Japanese bonds”) and ask you to select the correct graph showing the resulting shift and the direction of the exchange?rate change.
2. FRQ Prompt Pattern: You may be asked to (a) draw the FX graph, (b) label the shift, (c) explain the impact on net exports, and (d) discuss a policy tool (e.g., foreign?exchange intervention) that the central bank could use to offset the shift.
3. Distinguishing “Change in Quantity Demanded” vs. “Change in Demand”: A movement along the demand curve (caused by a change in the exchange rate itself) is not a curve shift. The exam tests this nuance heavily.
4. Policy?Tool Tie?In: The AP exam expects you to know that a central?bank foreign?exchange intervention (buying or selling its own currency) directly shifts the supply or demand curve in the FX market.

Quick Check Questions

1. MCQ: The Federal Reserve raises the federal funds rate. Which of the following correctly describes the effect on the U.S. dollar in the foreign?exchange market?
2. A) Supply of dollars shifts left-dollar appreciates.
3. B) Demand for dollars shifts right-dollar appreciates.
4. C) Supply of dollars shifts right-dollar depreciates.
5. D) Demand for dollars shifts left-dollar depreciates.

Answer: B – Higher U.S. rates attract foreign capital, increasing demand for dollars and causing an appreciation.

1. FRQ?style: “A sudden surge in tourism from Canada to the United States causes U.S. tourists to buy more Canadian dollars.”
2. (a) Draw the FX graph showing the shift.
3. (b) Identify the new equilibrium exchange rate (E?) relative to the original (E?).
4. (c) Explain one likely impact on the U.S. trade balance.

Answer Sketch:
- (a) Supply of USD unchanged; Demand for USD (by Canadians) shifts left-Supply of USD effectively shifts right.
- (b) E? < E? (U.S. dollar depreciates).
- (c) A weaker dollar makes U.S. exports cheaper abroad, increasing net exports and narrowing the trade deficit.

Last?Minute Cram Sheet (10 One?Liners)

1. FX graph axes: vertical = exchange rate (price), horizontal = quantity of foreign currency.
2. Rightward demand shift-currency appreciates (higher E).
3. Rightward supply shift-currency depreciates (lower E).
4. Higher domestic interest rate-demand for domestic currency ? (capital inflow).
5. Current?account surplus-demand for domestic currency ? (rightward demand shift).
6. Capital?account deficit-supply of domestic currency ? (rightward supply shift).
7. Real Exchange Rate (RER) = (E × P_domestic) / P_foreign.
8. Interest?Rate Parity: (1 + i_domestic) = (1 + i_foreign)·(E_expected / E).
9. “Supply ?” in FX means the curve moves right, not up; price (exchange rate) falls.
10. Central?bank FX intervention: buying its own currency-leftward supply shift-appreciation; selling-rightward supply shift-depreciation.

Good luck—remember to label every curve, equilibrium point, and shift on the exam!