AP exam review verified for 2027
AP Macroeconomics Unit 6 Review: Open Economy - International Trade and Finance
Review AP Macro Unit 6 to understand how open economies interact through trade, currency exchange, and capital flows. This unit connects the foreign exchange market, balance of payments accounting, and interest rate differentials to show how global forces shape domestic output and aggregate demand.
Use the topic guides, practice questions, and FRQ practice available for every topic in this unit to build exam-ready skills.
AP exam review verified for 2027
What is AP Macroeconomics unit 6?
Unit 6 opens up the macroeconomic models from earlier units to the rest of the world. Every transaction a country makes with foreign buyers, sellers, or investors gets recorded in the balance of payments. The price at which currencies trade determines whether a country's goods look cheap or expensive abroad, and that price is set by supply and demand in the foreign exchange market just like any other market.
Unit 6 is about how open economies interact globally. It covers balance of payments accounting, exchange rate determination, what shifts currency supply and demand, how currency values affect net exports and aggregate demand, and how real interest rate differences move financial capital across borders.
Foreign Exchange Market
The forex market sets the exchange rate through currency supply and demand. Demand for a currency comes from foreigners buying that country's goods, services, and assets. Supply comes from domestic residents buying foreign goods, services, and assets. Equilibrium is where those curves intersect.
Policy, Capital Flows, and Net Exports
Fiscal and monetary policy shift interest rates, which attract or repel financial capital, which shifts currency demand, which changes the exchange rate, which changes net exports and aggregate demand. This chain of effects connects Unit 6 directly to the AD-AS model from Unit 3.
Everything connects through the exchange rate
The exchange rate is the central variable in Unit 6. It is determined in the forex market, influenced by policy and interest rates, and it feeds back into net exports and aggregate demand. When a country's real interest rate rises, capital flows in, the currency appreciates, exports fall, and net exports decrease. That single chain of logic ties together every topic in the unit and is the most common multi-step reasoning task on the AP exam.
AP Macroeconomics unit 6 topics
Balance of Payments Accounts
The BOP records all international transactions as credits or debits across the current account (net exports, income, transfers) and the capital and financial account (asset purchases, FDI, portfolio investment). CA + CFA = 0 always.
Exchange Rates
An exchange rate is the price of one currency in terms of another. Appreciation means a currency buys more of another; depreciation means it buys less. You must be able to calculate and convert between currency quotes.
The Foreign Exchange Market
The forex market uses a standard supply-and-demand graph. Currency demand slopes downward (lower rate makes exports cheaper); currency supply slopes upward (higher rate makes imports cheaper). Equilibrium is where the two curves intersect.
Effect of Changes in Policies and Economic Conditions on the Foreign Exchange Market
Fiscal policy, monetary policy, income changes, and trade barriers all shift currency supply or demand and change the equilibrium exchange rate. Higher interest rates attract capital, increase currency demand, and cause appreciation.
Changes in the Foreign Exchange Market and Net Exports
Appreciation reduces net exports (exports fall, imports rise) and shifts AD left. Depreciation increases net exports (exports rise, imports fall) and shifts AD right. This is the direct link between the forex market and the AD-AS model.
Real Interest Rates and International Capital Flows
Financial capital flows toward countries with higher real interest rates. That flow appreciates the receiving country's currency, increases loanable funds supply, and creates a CFA surplus. Central banks influence these flows by changing short-run domestic interest rates.
practice snapshot
Hardest AP Macroeconomics unit 6 topics
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Across 9.7k multiple-choice practice attempts for this unit.
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Across 29 scored free-response attempts for this unit.
Hardest topics in unit 6
MCQ miss rate6.6
Review Real Interest Rates and International Capital Flows with attention to how the concept appears in AP-style source and evidence questions.
40%2,184 tries
6.5
Review Changes in the Foreign Exchange Market and Net Exports with attention to how the concept appears in AP-style source and evidence questions.
40%1,213 tries
6.4
Review Effect of Changes in Policies and Economic Conditions on the Foreign Exchange Market with attention to how the concept appears in AP-style source and evidence questions.
39%2,039 tries
Unit 6 review notes
6.1
Balance of Payments Accounts
The balance of payments (BOP) is the accounting system that records all of a country's international transactions over a given period. It has two main components: the current account and the capital and financial account. Any transaction that brings money into a country is a credit; any transaction that sends money out is a debit. Because every transaction has two sides, the BOP always balances: CA + CFA = 0.
- Current Account (CA): Records net exports of goods and services, net income from abroad (primary income), and net unilateral transfers (secondary income). Can show a surplus or deficit.
- Capital and Financial Account (CFA): Records financial capital transfers and purchases and sales of assets between countries, including foreign direct investment and portfolio investment. A surplus means capital is flowing in; a deficit means capital is flowing out.
- CA + CFA = 0: The two accounts must sum to zero. A current account deficit is offset by a capital and financial account surplus of equal magnitude.
- Credit vs. Debit: A credit is any transaction that causes money to flow into the country (e.g., an export sale or a foreign purchase of domestic assets). A debit is any transaction that sends money out (e.g., an import purchase or a domestic purchase of foreign assets).
- Official Reserves Account: Part of the CFA that records changes in the central bank's foreign exchange reserves, used to track government intervention in currency markets.
If a country runs a current account deficit of $50 billion, what must be true about its capital and financial account?
| Account | What It Records | Surplus Means | Deficit Means |
|---|---|---|---|
| Current Account (CA) | Net exports, net income from abroad, net unilateral transfers | Exports exceed imports (net capital outflow) | Imports exceed exports (net capital inflow) |
| Capital and Financial Account (CFA) | Asset purchases/sales, FDI, portfolio investment, official reserves | Capital flowing into the country | Capital flowing out of the country |
6.2
Exchange Rates
An exchange rate is the price of one currency expressed in terms of another. Because every exchange rate compares two currencies, one currency appreciating always means the other is depreciating by the same proportion. You need to be able to convert between currency quotes and calculate the value of one currency in terms of another.
- Exchange Rate: The price of one currency in terms of another, set in the foreign exchange market. Example: 1 USD = 1.25 CAD means one U.S. dollar buys 1.25 Canadian dollars.
- Appreciation: A currency appreciates when it becomes more valuable relative to another currency. If 1 USD now buys 1.40 CAD instead of 1.25 CAD, the dollar has appreciated.
- Depreciation: A currency depreciates when it becomes less valuable relative to another currency. If 1 USD now buys only 1.10 CAD, the dollar has depreciated.
- Reciprocal Exchange Rate: If 1 USD = 1.25 CAD, then 1 CAD = 1/1.25 = 0.80 USD. You must be able to calculate the inverse quote.
If the exchange rate changes from 1 USD = 100 yen to 1 USD = 120 yen, has the dollar appreciated or depreciated? What happened to the yen?
| Currency Change | Effect on Exchange Rate Quote | Effect on the Other Currency |
|---|---|---|
| Dollar appreciates | Each dollar buys more foreign currency | Foreign currency depreciates |
| Dollar depreciates | Each dollar buys less foreign currency | Foreign currency appreciates |
6.3
The Foreign Exchange Market
The foreign exchange market works like any supply-and-demand model. The vertical axis shows the exchange rate (price of the domestic currency in terms of foreign currency) and the horizontal axis shows the quantity of the domestic currency traded. Demand slopes downward because a lower exchange rate makes domestic goods cheaper for foreigners, increasing demand for the currency. Supply slopes upward because a higher exchange rate makes foreign goods cheaper for domestic residents, increasing their purchases of foreign currency and thus the supply of domestic currency.
- Demand for a Currency: Comes from foreigners who want to buy that country's goods, services, and financial assets. Slopes downward: lower exchange rate means cheaper exports, so more currency is demanded.
- Supply of a Currency: Comes from domestic residents buying foreign goods, services, and assets. Slopes upward: higher exchange rate makes foreign goods relatively cheaper, so domestic residents supply more of their currency.
- Equilibrium Exchange Rate: The exchange rate at which quantity demanded equals quantity supplied. Above equilibrium there is a surplus of currency (excess supply); below equilibrium there is a shortage (excess demand).
- Surplus vs. Shortage: A surplus of currency means the exchange rate is above equilibrium and will fall. A shortage means the exchange rate is below equilibrium and will rise.
On a forex graph for U.S. dollars, what does the demand curve represent and why does it slope downward?
| Market Condition | Exchange Rate Position | Market Pressure |
|---|---|---|
| Surplus (excess supply) | Above equilibrium | Exchange rate falls toward equilibrium |
| Shortage (excess demand) | Below equilibrium | Exchange rate rises toward equilibrium |
| Equilibrium | At intersection of S and D | No pressure to change |
6.4
Policy and Economic Conditions in the Forex Market
The equilibrium exchange rate changes when something shifts the demand for or supply of a currency. Fiscal and monetary policy both feed into the forex market through their effects on income, prices, and especially interest rates. Higher domestic interest rates attract foreign capital, increasing demand for the domestic currency and causing it to appreciate. Expansionary fiscal policy raises income and may raise interest rates, while expansionary monetary policy lowers interest rates and tends to depreciate the currency.
- Demand Shifters: Factors that shift currency demand include changes in foreign income (affects demand for exports), changes in relative price levels, changes in domestic interest rates, and changes in preferences for domestic assets.
- Supply Shifters: Factors that shift currency supply include changes in domestic income (affects demand for imports), trade barriers like tariffs and quotas on foreign goods, and changes in preferences for foreign assets.
- Expansionary Monetary Policy: Lowers domestic interest rates, reduces demand for domestic assets from abroad, decreases demand for the currency, and causes depreciation.
- Contractionary Monetary Policy: Raises domestic interest rates, attracts foreign capital, increases demand for the currency, and causes appreciation.
- Expansionary Fiscal Policy: Can raise domestic interest rates (crowding out), attracting capital inflows, increasing currency demand, and causing appreciation.
If the Federal Reserve raises interest rates, trace the effect through the forex market to the exchange rate.
| Policy | Effect on Interest Rates | Effect on Currency Demand | Exchange Rate Effect |
|---|---|---|---|
| Expansionary Monetary Policy | Decreases | Decreases (less attractive to foreign investors) | Depreciates |
| Contractionary Monetary Policy | Increases | Increases (more attractive to foreign investors) | Appreciates |
| Expansionary Fiscal Policy | May increase (crowding out) | Increases | Appreciates |
| Tariff on imports | No direct effect | Increases (less supply of domestic currency) | Appreciates |
6.5
Exchange Rate Changes and Net Exports
Once the exchange rate changes, it directly affects the relative prices of a country's exports and imports, which changes net exports (NX), which shifts aggregate demand. This is the link between the forex market and the AD-AS model. Appreciation makes exports more expensive for foreigners and imports cheaper for domestic consumers, so NX falls and AD shifts left. Depreciation does the opposite.
- Appreciation and Net Exports: When a currency appreciates, exports become more expensive for foreign buyers and imports become cheaper domestically. Exports fall, imports rise, net exports decrease, and aggregate demand shifts left.
- Depreciation and Net Exports: When a currency depreciates, exports become cheaper for foreign buyers and imports become more expensive domestically. Exports rise, imports fall, net exports increase, and aggregate demand shifts right.
- Net Exports (NX): NX = Exports minus Imports. A positive NX is a trade surplus; a negative NX is a trade deficit. Changes in the exchange rate are a key driver of NX changes.
If the U.S. dollar depreciates against the euro, what happens to U.S. exports to Europe, U.S. imports from Europe, and U.S. aggregate demand?
| Currency Change | Effect on Exports | Effect on Imports | Effect on NX | Effect on AD |
|---|---|---|---|---|
| Appreciation | Decrease (more expensive abroad) | Increase (cheaper domestically) | Decreases | Shifts left |
| Depreciation | Increase (cheaper abroad) | Decrease (more expensive domestically) | Increases | Shifts right |
6.6
Real Interest Rates and International Capital Flows
When real interest rates differ across countries, financial capital flows toward the country with the higher real interest rate because investors seek better returns. This capital movement shows up simultaneously in three markets: the loanable funds market (supply of loanable funds increases in the receiving country), the foreign exchange market (demand for the receiving country's currency increases, causing appreciation), and the balance of payments (capital and financial account surplus). Central banks can influence domestic real interest rates in the short run through monetary policy, which in turn affects how much capital flows in or out.
- Real Interest Rate: The nominal interest rate adjusted for inflation. Investors compare real rates across countries when deciding where to place financial capital.
- Capital Flows Toward Higher Real Rates: If Country A's real interest rate rises above Country B's, financial capital flows from B to A. Country A sees a CFA surplus, currency appreciation, and an increase in loanable funds supply.
- Loanable Funds Market Effect: Capital inflows increase the supply of loanable funds in the receiving country, putting downward pressure on domestic real interest rates over time.
- Forex Market Effect: Capital inflows increase demand for the receiving country's currency, causing it to appreciate, which then reduces net exports.
- Central Bank Influence: Central banks can raise or lower short-run domestic interest rates through open market operations, directly affecting the size and direction of international capital flows.
If the European Central Bank raises real interest rates while the Fed holds rates steady, trace the effects on capital flows, the euro, and European net exports.
| Market | Effect of Capital Inflow (Higher Domestic Real Rate) | Graph Shift |
|---|---|---|
| Loanable Funds Market | Supply of loanable funds increases, real interest rate falls toward equilibrium | Supply curve shifts right |
| Foreign Exchange Market | Demand for domestic currency increases, currency appreciates | Demand curve shifts right |
| Balance of Payments (CFA) | Capital and financial account moves toward surplus | Net capital inflows increase |
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Key terms
| Term | Definition |
|---|---|
| Official Reserves Account | Part of the capital and financial account that records changes in the central bank's holdings of foreign exchange reserves, used to track government intervention in currency markets. |
| Appreciation | An increase in the value of a currency relative to another. Causes exports to become more expensive for foreign buyers and imports to become cheaper domestically, reducing net exports. |
| Depreciation | A decrease in the value of a currency relative to another. Causes exports to become cheaper for foreign buyers and imports to become more expensive domestically, increasing net exports. |
| Demand for a currency | Arises from foreigners wanting to buy a country's goods, services, and financial assets. Slopes downward on a forex graph because a lower exchange rate makes exports cheaper. |
| Supply of a currency | Arises from domestic residents buying foreign goods, services, and assets. Slopes upward on a forex graph because a higher exchange rate makes imports cheaper, increasing foreign purchases. |
| Real Interest Rate | The nominal interest rate adjusted for inflation. International capital flows toward the country with the higher real interest rate, affecting the forex market and loanable funds market. |
| Contractionary Monetary Policy | Raises domestic interest rates, attracts foreign capital inflows, increases demand for the domestic currency, and causes currency appreciation. |
| Expansionary Monetary Policy | Lowers domestic interest rates, reduces foreign demand for domestic assets, decreases demand for the currency, and causes currency depreciation. |
| central bank intervention | When a central bank buys or sells its own currency in the forex market to influence the exchange rate and offset unwanted appreciation or depreciation. |
| quotas | Quantitative limits on imports that reduce domestic residents' need to supply their currency to buy foreign goods, shifting the currency supply curve left and causing appreciation. |
| shortage | In the forex market, a condition where the quantity of currency demanded exceeds the quantity supplied at the current exchange rate, creating upward pressure on the exchange rate. |
Common unit 6 mistakes
Confusing CA surplus with capital outflow
A current account surplus means the country is a net exporter and money is flowing in on the current account, but it is offset by a capital and financial account deficit (capital flowing out). Students often flip the direction of the CFA when the CA is in surplus.
Mixing up appreciation and depreciation effects on exports
Appreciation makes domestic goods more expensive for foreigners, so exports fall. Students sometimes reason that a stronger currency is good for trade and incorrectly say exports rise. Always think about the foreign buyer's perspective: a stronger dollar means U.S. goods cost more in euros.
Forgetting that expansionary monetary policy depreciates the currency
Expansionary monetary policy lowers interest rates, which reduces demand for domestic assets from foreign investors, which decreases demand for the currency, causing depreciation. Students sometimes say the currency appreciates because the economy is growing.
Drawing the forex supply curve incorrectly
The supply of a currency slopes upward, not downward. A higher exchange rate makes foreign goods cheaper for domestic residents, so they buy more foreign goods and supply more of their own currency. Students sometimes draw it as downward sloping like a typical supply curve in a goods market.
Applying nominal interest rates instead of real interest rates in Topic 6.6
International capital flows respond to real interest rate differentials, not nominal ones. If a country has a high nominal rate but also high inflation, the real rate may be low and capital will not necessarily flow in.
How this unit shows up on the AP exam
Multi-step policy transmission chains
A common task in AP Macro Unit 6 is tracing a single policy change through multiple markets in sequence. For example, a central bank raising interest rates affects the loanable funds market, then the forex market, then net exports, then aggregate demand. Free-response questions often ask you to explain each step and draw the corresponding graph shifts. Practice writing out the full chain in complete sentences, not just identifying the endpoint.
Forex market graph drawing and shifting
The foreign exchange market graph is a high-frequency graph task in AP Macro. You need to correctly label axes (exchange rate on vertical, quantity of currency on horizontal), draw correctly sloped supply and demand curves, identify equilibrium, and shift the appropriate curve in response to a stated change in policy or economic conditions. Errors in axis labels or curve direction are common point losses.
BOP calculation and classification
Multiple-choice and free-response questions may present a set of international transactions and ask you to calculate the current account balance, the capital and financial account balance, or verify that BOP = 0. You need to correctly identify whether each transaction is a credit or debit and which account it belongs to. The CA + CFA = 0 identity is also used to infer one account balance from the other.
Final unit 6 review checklist
- Calculate CA, CFA, and BOP
Given a list of international transactions, correctly classify each as a credit or debit, assign it to the CA or CFA, and verify that CA + CFA = 0.
- Convert and interpret exchange rates
Calculate the value of one currency in terms of another, compute the reciprocal quote, and correctly identify which currency appreciated or depreciated when the rate changes.
- Draw and shift the forex market graph
Set up a forex graph with exchange rate on the vertical axis and quantity of currency on the horizontal axis. Correctly draw demand (downward sloping) and supply (upward sloping), find equilibrium, and shift curves in response to policy or economic changes.
- Trace policy effects through the forex market
For any fiscal or monetary policy change, identify whether it raises or lowers interest rates, determine the effect on currency demand or supply, and state whether the currency appreciates or depreciates.
- Link exchange rate changes to net exports and AD
Explain how appreciation decreases NX and shifts AD left, and how depreciation increases NX and shifts AD right. Connect this back to the AD-AS model from Unit 3.
- Explain capital flows using real interest rate differentials
State the direction of capital flows when real interest rates differ across countries, and trace the simultaneous effects on the loanable funds market, the forex market, and the balance of payments.
- Connect all three markets in a multi-step chain
Practice tracing a single policy change (e.g., the Fed raises rates) through the loanable funds market, the forex market, net exports, and aggregate demand in one coherent sequence.
How to study unit 6
Start with BOP accounting (Topic 6.1)
Read the Topic 6.1 guide and practice classifying transactions as credits or debits in the CA or CFA. Work through numerical examples until CA + CFA = 0 feels automatic. This accounting foundation supports every other topic in the unit.
Build exchange rate fluency (Topics 6.2 and 6.3)
Study the Topic 6.2 guide to practice currency conversion and reciprocal quotes. Then move to Topic 6.3 and draw the forex market graph from scratch, labeling axes, curves, and equilibrium. Practice identifying surpluses and shortages and the direction of adjustment.
Practice policy shifts in the forex market (Topic 6.4)
Use the Topic 6.4 guide to work through fiscal and monetary policy scenarios. For each policy, write out the chain: policy changes interest rates, interest rates affect capital flows, capital flows shift currency demand or supply, exchange rate changes. Draw the graph shift for each scenario.
Connect forex changes to net exports and AD (Topic 6.5)
Review the Topic 6.5 guide and practice linking exchange rate changes to NX and then to the AD-AS graph. Make sure you can explain the full chain in writing, not just identify the direction of the shift.
Understand the three-market chain for capital flows (Topic 6.6)
Study the Topic 6.6 guide and practice drawing the loanable funds market and forex market side by side. Trace a real interest rate increase through both graphs simultaneously. Use available FRQ practice to rehearse multi-step explanations that connect all three markets.
More ways to review
Topic study guides
Open the individual guides for Unit 6 when you want a closer review of one topic.
Practice questions
Use AP-style practice after you review the notes so you can check what you understand.
FRQ practice
Practice free-response reasoning and compare your answer with scoring guidance.
Cram archive videos
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Official unit cheatsheet
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Score calculator
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Unit 6 printables
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get printablesFrequently Asked Questions
What topics are covered in AP Macro Unit 6?
AP Macro Unit 6 covers six topics: Balance of Payments Accounts (6.1), Exchange Rates (6.2), the Foreign Exchange Market (6.3), Effect of Changes in Policies and Economic Conditions on the Foreign Exchange Market (6.4), Changes in the Foreign Exchange Market and Net Exports (6.5), and Real Interest Rates and International Capital Flows (6.6). The unit focuses on how countries interact through global product and financial markets, and how currency exchange connects domestic economic activity to the rest of the world. See the full breakdown at AP Macro Unit 6.
How much of the AP Macro exam is Unit 6?
AP Macro Unit 6 makes up 10-13% of the AP exam. That slice covers open economy concepts including exchange rates, the foreign exchange market, balance of payments accounts, and how real interest rates drive international capital flows. It's a smaller unit by topic count (6 topics), but the foreign exchange market graph is a reliable exam target, so it punches above its weight.
What's on the AP Macro Unit 6 progress check (MCQ and FRQ)?
The AP Macro Unit 6 progress check includes both MCQ and FRQ parts drawn from all six unit topics: Balance of Payments Accounts, Exchange Rates, the Foreign Exchange Market, policy effects on the foreign exchange market, changes in net exports, and Real Interest Rates and International Capital Flows. MCQ questions typically test your ability to read foreign exchange market graphs and trace cause-and-effect chains when policies shift. The FRQ portion often asks you to draw or shift the foreign exchange market and explain the impact on net exports or the balance of payments. Practice with matched questions at AP Macro Unit 6 before sitting the official progress check.
How do I practice AP Macro Unit 6 FRQs?
AP Macro Unit 6 FRQs most often ask you to draw and shift the foreign exchange market, explain how a change in real interest rates triggers international capital flows, or trace a policy change through to net exports and the balance of payments. To practice, start by drawing the foreign exchange market from scratch until the supply and demand labels feel automatic. Then work through multi-step prompts: a change in interest rates, the effect on currency demand, the resulting shift in exchange rates, and the final impact on net exports. Check your logic at each step. You can find FRQ practice aligned to these topics at AP Macro Unit 6.
Where can I find AP Macro Unit 6 practice questions?
For AP Macro Unit 6 MCQ and practice test questions, head to AP Macro Unit 6. You'll find multiple-choice questions covering exchange rates, the foreign exchange market, balance of payments accounts, and real interest rates and capital flows. When using any practice set, prioritize questions that ask you to interpret foreign exchange market graphs and trace policy effects, since those formats appear most often on the actual exam.
How should I study AP Macro Unit 6?
Start AP Macro Unit 6 by building a solid understanding of exchange rates and how the foreign exchange market works, since every other topic in the unit connects back to that graph. Here's a concrete plan: 1. **Learn the foreign exchange market graph first.** Practice drawing it, labeling supply and demand for a currency, and shifting each curve for different scenarios. 2. **Master the balance of payments accounts (6.1).** Know the difference between the current account and the financial account, and how they relate to net exports. 3. **Work through policy effects (6.4).** For each policy (fiscal, monetary, trade), trace the full chain: policy change, effect on real interest rates, capital flow direction, currency demand shift, exchange rate result, net export impact. 4. **Connect 6.5 and 6.6.** Practice linking foreign exchange market shifts to changes in net exports and international capital flows in one continuous argument. 5. **Do timed graph questions.** Set a 10-minute timer and draw the full cause-and-effect sequence without notes. Since Unit 6 is 10-13% of the exam, a few hours of focused graph practice can move your score. Find topic-by-topic resources at AP Macro Unit 6.