How does the foreign exchange market determine the exchange rate?
Topic 6.3 The Foreign Exchange Market: draw the foreign exchange market for a currency, explain the supply of and demand for it, and find the equilibrium exchange rate.
A focused answer to AP Macroeconomics Topic 6.3, covering the supply of and demand for a currency in the foreign exchange market, the equilibrium exchange rate, what each curve represents, and how to read appreciation and depreciation off the graph, with a worked graphing question.
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What this topic is asking
Topic 6.3 introduces the foreign exchange (forex) market, the supply-and-demand diagram that determines the exchange rate. The College Board wants you to draw the market for a currency, explain who supplies and who demands it, find equilibrium, and read appreciation and depreciation off the graph. This is the central model of Unit 6.
Supply and demand for a currency
Equilibrium, appreciation, and depreciation
Equilibrium is where supply meets demand, setting the equilibrium exchange rate.
What shifts these curves, interest rates, income, prices, tastes, and expectations, is the subject of the next topic. Here the focus is the structure of the market and reading off appreciation or depreciation.
Try this
Q1. Who demands the domestic currency in the foreign exchange market? [1 point]
- Cue. Foreigners who need it to buy the country's goods, services, and assets.
Q2. Demand for the domestic currency falls. Does it appreciate or depreciate? [1 point]
- Cue. It depreciates (the equilibrium exchange rate falls).
Exam-style practice questions
Practice questions written in the style of College Board exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
AP 2019 (style)1 marksMultiple choice. In the foreign exchange market for the domestic currency, the demand for the currency comes from (A) domestic residents wanting foreign goods. (B) foreigners wanting domestic goods and assets. (C) the domestic central bank only. (D) domestic importers. (E) foreign exporters paid in their own currency.Show worked answer →
The answer is (B). In the market for the domestic currency, demand comes from foreigners who need the domestic currency to buy that country's goods, services, and assets. Supply comes from domestic residents offering their currency to obtain foreign currency (to buy foreign goods or assets).
(A), (D), and (E) describe the supply side (domestic residents seeking foreign currency). (C) is too narrow. Foreigners wanting domestic goods and assets create the demand, so (B).
AP 2021 (style)5 marksFree response. (a) Draw a correctly labelled foreign exchange market graph for the domestic currency, showing equilibrium. (b) State what is on each axis. (c) Explain who supplies and who demands the currency. (d) Foreign demand for the country's exports rises. Show the effect on your graph. (e) State whether the domestic currency appreciates or depreciates.Show worked answer →
A 5-point graphing FRQ.
(a) Graph (1 point): vertical axis exchange rate (price of the domestic currency in foreign currency), horizontal axis quantity of the domestic currency; upward-sloping supply and downward-sloping demand crossing at the equilibrium exchange rate.
(b) Axes (1 point): vertical axis is the exchange rate (price of the domestic currency); horizontal axis is the quantity of the domestic currency.
(c) Supply and demand (1 point): demand comes from foreigners wanting domestic goods and assets; supply comes from domestic residents offering their currency to buy foreign goods and assets.
(d) Shift (1 point): higher foreign demand for exports increases demand for the domestic currency; shift demand right.
(e) Result (1 point): the domestic currency appreciates (the equilibrium exchange rate rises).
Markers reward correct axes, the supply and demand sources, a rightward demand shift, and appreciation.
Related dot points
- Topic 6.2 Exchange Rates: define the nominal exchange rate, distinguish appreciation from depreciation, and calculate exchange rates between two currencies.
A focused answer to AP Macroeconomics Topic 6.2, covering the definition of the exchange rate, currency appreciation and depreciation, how to convert between currencies, and the effect of exchange-rate changes on the relative price of goods, with full worked calculations.
- Topic 6.4 Effect of Changes in Policies and Economic Conditions on the Foreign Exchange Market: identify the determinants that shift currency supply and demand, including interest rates, income, prices, and tastes.
A focused answer to AP Macroeconomics Topic 6.4, covering the determinants that shift currency supply and demand in the foreign exchange market, including relative interest rates, relative income, relative price levels, tastes, and speculation, and how monetary policy moves exchange rates, with a worked graphing question.
- Topic 6.5 Changes in the Foreign Exchange Market and Net Exports: explain how appreciation and depreciation change net exports, and trace the effect on aggregate demand.
A focused answer to AP Macroeconomics Topic 6.5, covering how currency appreciation and depreciation change exports and imports, the effect on net exports, and how this feeds through the foreign exchange market into aggregate demand and the AD-AS model, with a worked chained question.
- Topic 6.1 Balance of Payments Accounts: describe the current account and the capital (financial) account, and explain why the two must offset each other.
A focused answer to AP Macroeconomics Topic 6.1, covering the balance of payments, the current account and the capital (financial) account, what each records, and why the two accounts must offset so the overall balance is zero, with a worked classification question.
- Topic 6.6 Real Interest Rates and International Capital Flows: explain how differences in real interest rates between countries drive international capital flows, exchange rates, and net exports.
A focused answer to AP Macroeconomics Topic 6.6, covering how relative real interest rates drive international capital flows, how those flows change the exchange rate and net exports, and how this links the loanable funds market, the foreign exchange market, and the AD-AS model, with a worked chained question.
Sources & how we know this
- AP Macroeconomics Course and Exam Description — College Board (2023)