AP Macroeconomics: Exchange Rates (Appreciation vs Depreciation, Fixed vs Floating)

AP Macroeconomics – Exchange Rates (Appreciation vs Depreciation, Fixed vs Floating)

AP Macroeconomics – Exchange Rates (Appreciation vs. Depreciation, Fixed vs. Floating)

What This Is

Exchange rates tell you how many units of one country’s currency you need to buy one unit of another currency (e.g., 1?USD?=?0.85?EUR). They are crucial on the AP exam because every question about imports, exports, balance?of?payments, or monetary policy starts with “what happens to the exchange rate…?” Real?world example: In 2022 the Japanese yen depreciated against the dollar, making Japanese cars cheaper for U.S. buyers and boosting Japan’s export earnings.

Key Terms & Formulas

• Exchange Rate (ER) – price of foreign currency in terms of domestic currency (e.g., ¥/USD).
• Appreciation – domestic currency becomes more expensive relative to foreign currency (ER falls).
• Depreciation – domestic currency becomes cheaper (ER rises).
• Floating Exchange Rate – ER is determined by market forces of supply and demand; no official target.
• Fixed (Pegged) Exchange Rate – government or central bank sets a specific ER and intervenes to keep it at that level.
• Foreign?Exchange Market (FX Market) – graph with price of foreign currency (vertical axis) vs. quantity of foreign currency exchanged (horizontal axis); the demand curve slopes down, the supply curve slopes up.
• Interest?Rate Parity (IRP) Formula:
  [ (1 + i_{\text{domestic}}) = (1 + i_{\text{foreign}})\frac{E_t}{E_{t+1}^{e}} ]
  where (i) = nominal interest rate, (E_t) = current spot ER, (E_{t+1}^{e}) = expected future ER.
• Balance?of?Payments (BoP) Surplus/Deficit – BoP = Current Account + Capital/Financial Account; a surplus puts upward pressure on the domestic currency, a deficit pushes it down.
• Monetary?Policy Effect on ER: An expansionary monetary policy (lower Fed funds rate)-lower domestic interest rate-capital outflow-depreciation.
• Currency Intervention (Sterilized vs. Unsterilized):
• Unsterilized: Central bank buys/sells foreign currency, directly changing ER.
• Sterilized: Same foreign?exchange operation plus offsetting open?market operation to keep the money supply unchanged.

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

1. Identify the policy or shock (e.g., “The Fed lowers the federal funds rate”).
2. State the immediate effect on the domestic interest rate (?).
3. Show the impact on the FX market: draw the FX supply?demand graph; shift the demand for domestic currency left (or supply right)-depreciation (ER rises).
4. Link the exchange?rate change to the real?economy: a depreciation makes exports cheaper and imports more expensive-AD shifts right in the AD?AS model.
5. Conclude with the new equilibrium (higher output, higher price level) and note any secondary effects (e.g., improved trade balance, possible inflationary pressure).

Common Mistakes

• Mistake: “Appreciation = ER goes up.”
  Correction: Appreciation means the domestic currency strengthens, so the price of foreign currency falls (ER moves down).

• Mistake: Treating a fixed?rate as “no change ever.”
  Correction: Fixed rates can still adjust if the government re?pegs or abandons the peg; the key is that the central bank actively intervenes to maintain the target.

• Mistake: Confusing a movement along the FX curve with a shift of the curve.
  Correction: A change in the spot ER caused by a change in the price of foreign currency is a movement; a change in fundamentals (e.g., BoP deficit) shifts the demand or supply curve.

• Mistake: Assuming that a depreciation automatically raises inflation.
  Correction: Depreciation raises the price of imported goods, but overall inflation depends on the size of imports relative to the price level and on monetary?policy response.

• Mistake: Forgetting the direction of the capital?account flow under a floating rate.
  Correction: Lower domestic rates-capital outflow-supply of domestic currency rises-depreciation.

AP Exam Insights

1. Graph?Only Questions: You’ll often be asked to draw the FX market and label the shift (e.g., “Show the effect of a current?account deficit on the exchange rate”). Remember to label axes, curves, and the new equilibrium.
2. Policy Comparison: FRQs may compare a fixed?rate system (e.g., Hong Kong dollar) with a floating system (e.g., U.S. dollar) and ask which is more vulnerable to speculative attacks.
3. Cause?Effect Chains: Expect a multi?part question that starts with a monetary?policy change, moves to exchange?rate movement, then to AD?AS effects, and finally to inflation/unemployment outcomes.
4. Tricky Terminology: “Depreciation of the dollar” = increase in the dollar?per?foreign?currency ER; “Appreciation of the euro” = decrease in the dollar?per?euro ER.

Quick Check Questions

1. Multiple?Choice: If the European Central Bank raises the euro area interest rate while the U.S. Fed holds its rate steady, what happens to the USD/EUR exchange rate?
2. Answer: The dollar depreciates (USD/EUR rises).

3. Why: Higher euro rates attract capital to Europe, increasing demand for euros and supply of dollars-more dollars per euro.

4. FRQ?Style: “Country?A has a large current?account deficit. Explain how this deficit influences the exchange rate under a floating system, and describe one policy the central bank could use to counteract the effect.”

5. Answer: A deficit means a net outflow of domestic currency-supply of domestic currency rises in the FX market-depreciation. The central bank could sell foreign reserves (unsterilized intervention) to buy domestic currency, shifting the supply curve left and appreciating the currency.

6. Multiple?Choice: Which of the following is a characteristic of a fixed exchange?rate regime?
   A) Exchange rate determined solely by market forces.
   B) Central bank must hold large foreign?exchange reserves.
   C) Domestic interest rates are always higher than foreign rates.
   D) No government intervention in the FX market.

7. Answer: B.
8. Why: To maintain a peg, the central bank must be ready to buy/sell foreign currency, requiring substantial reserves.

Last?Minute Cram Sheet (10 One?Liners)

1. ER = price of foreign currency in domestic units (e.g., ¥/USD).
2. Appreciation = ER ?; Depreciation = ER ?.
3. Floating rate: market?driven; Fixed rate: government?set (requires reserves).
4. FX graph: vertical axis = ER, horizontal axis = quantity of foreign currency; demand slopes down, supply slopes up.
5. IRP: ((1+i_d) = (1+i_f)\frac{E_t}{E_{t+1}^e}) – links interest differentials to expected ER change.
6. Expansionary monetary policy-lower domestic i-capital outflow-depreciation.
7. Current?account deficit-excess supply of domestic currency-depreciation (floating).
8. Unsterilized intervention: central bank buys/sells foreign currency and changes the money supply.
9. Sterilized intervention: FX action plus offsetting open?market operation to keep money supply unchanged.
10. “Supply ?” on the FX graph = curve shifts right, not up – a shift changes the ER, a movement along the curve does not.

Good luck—remember: draw the graph first, label the shift, then explain the macro consequences!