A one-page visual summary of Open Economy: International Trade and Finance — every key topic, term, and theme you need to know for the exam, on a single screen.
What it covers: The balance of payments, the foreign exchange market, exchange rate determination, and how exchange rates affect net exports and capital flows.
Exam weight: About 10–13% of the AP Macroeconomics exam.
The big question: How do countries' currencies get valued against each other, and how does that valuation affect trade and investment flows?
Big Ideas covered: Exchange Rates as Prices, Trade Effects, and Capital Flows.
Key topics at a glance
Balance of Payments
Current account (trade, income, transfers) + financial account (asset flows) roughly balance — a current account deficit offsets a financial account surplus.
The Foreign Exchange Market
Currency supply and demand set the exchange rate, just like any other market — under a floating exchange rate system.
Determinants of Exchange Rates
Relative income, prices/inflation, interest rates, and preferences for goods/assets shift currency demand and supply.
Appreciation vs. Depreciation
Appreciation: currency strengthens, exports get pricier, imports get cheaper. Depreciation: the reverse.
Exchange Rates & Net Exports
Appreciation → net exports fall → AD shifts left. Depreciation → net exports rise → AD shifts right.
Interest Rates & Capital Flows
Higher relative real interest rates → more capital inflows → more currency demand → appreciation.
Tariffs (taxes on imports) and quotas (quantity limits) restrict trade and raise domestic prices of affected goods.
The key terms you must know
Current account — net exports, net investment income, and net transfers.
Financial (capital) account — net flows of financial assets between countries.
Foreign exchange market — where currencies are bought and sold, setting exchange rates.
Appreciation / depreciation — a currency strengthening or weakening relative to another.
Floating vs. fixed exchange rate — market-determined vs. government-set currency value.
Net exports (Xn) — exports minus imports; a component of aggregate demand.
Tariff / quota — a tax on imports vs. a quantity limit on imports.
Key themes to remember
Exchange rates are just prices. Everything that shifts supply and demand for any good applies here too — just substitute "currency" for "good."
A stronger currency is a double-edged sword. It cuts import costs for consumers but raises export prices for domestic producers abroad.
Interest rates and exchange rates are tightly linked. Anything that changes domestic interest rates (monetary policy, deficits) ripples through to the exchange rate via capital flows.
The current account and financial account are two sides of the same coin. They must roughly offset each other in a floating exchange rate system.
Common exam traps
Appreciation doesn't always help a country. It helps consumers buying imports but hurts exporters — don't assume "stronger currency = better."
Don't mix up which direction interest rates push the exchange rate. Higher domestic interest rates attract capital inflows, which appreciates the currency — not the reverse.
A current account deficit is not automatically bad. It's offset by a financial account surplus (foreign investment flowing in), which can fund domestic growth.
Expansionary monetary policy depreciates the currency; expansionary fiscal policy (via higher deficits and interest rates) tends to appreciate it. These two policies can pull the exchange rate in opposite directions.
Tariffs and quotas both restrict trade, but they work differently. A tariff is a tax (price-based); a quota is a quantity limit. Know which lever a question is describing.