Exchange Rates
Edexcel International GCSE EconomicsΒ· 2.2.3Β· 20 min read
1. 1. Core Exchange Rate Definitionsβ β ββββ± 5 min
β Calculator OK
Exchange rate
The price of one currency expressed in terms of another currency, e.g. Β£1 = $1.20 means 1 British pound buys 1.20 US dollars
Appreciation: Market-driven rise in currency value
Depreciation: Market-driven fall in currency value
Revaluation: Deliberate government rise in fixed exchange rate value
Devaluation: Deliberate government fall in fixed exchange rate value
If the exchange rate changes from Β£1 = $1.15 to Β£1 = $1.25, state whether the pound has appreciated or depreciated, and use the SPICED mnemonic to explain the impact on UK import prices from the US.
- 1
- The pound now buys more US dollars, so it has appreciated (risen in value against the dollar).
- 2
- Applying SPICED: a stronger pound means UK imports from the US become cheaper for UK consumers.
2. 2. FX Market Diagrams & Factors Shifting Currency Valueβ β β βββ± 7 min
β Calculator OK
In floating exchange rate systems, currency value is determined by the supply of and demand for the currency in foreign exchange (FX) markets. Four key factors shift these curves:
Interest rates: Higher domestic interest rates attract foreign investors, raising demand for the domestic currency
Currency speculators: If investors expect a currency to rise in value, they buy it now, raising demand
Export demand: Higher global demand for a country's exports raises demand for its currency
Import demand: Higher domestic demand for foreign goods raises supply of the domestic currency as consumers exchange it for foreign currency
Draw a foreign exchange market diagram for the British pound, showing the effect of a rise in UK interest rates on the exchange rate of the pound against the US dollar.
- 1
- Label the vertical axis Exchange rate ($ per Β£) and the horizontal axis Quantity of pounds (Β£).
- 2
- Plot the downward-sloping demand curve D1 for pounds, upward-sloping supply curve S1 for pounds, and mark equilibrium E1 at exchange rate ER1 and quantity Q1.
- 3
- Higher UK interest rates attract US investors, so demand for pounds shifts right to D2.
- 4
- The new equilibrium E2 has a higher exchange rate ER2, meaning the pound has appreciated against the dollar.
3. 3. Impacts of Appreciation & Revaluationβ β β βββ± 4 min
β Calculator OK
Appreciation (market-driven) and revaluation (policy-driven) both increase the value of a currency, so they have identical impacts on import/export prices and the current account.
The Indian rupee appreciates by 10% against the euro. Analyse the impact of this change on India's current account of the balance of payments.
- 1
- Appreciation means 1 rupee buys more euros, so Indian exports to the EU become more expensive for EU consumers, reducing demand for Indian exports and lowering export revenue.
- 2
- Imports from the EU to India become cheaper for Indian consumers, increasing demand for EU imports and raising import spending.
- 3
- Lower export revenue and higher import spending will worsen India's current account balance, assuming demand for imports and exports is responsive to price changes.
4. 4. Impacts of Depreciation & Devaluationβ β β β ββ± 4 min
β Calculator OK
Depreciation (market-driven) and devaluation (policy-driven) both reduce the value of a currency, so they have identical impacts on import/export prices and the current account. Evaluate questions require you to weigh both positive and negative impacts of these changes.
The Nigerian naira is devalued by 15% against the US dollar. Evaluate the impact of this change on the Nigerian economy.
- 1
- Positive impact: Devaluation makes Nigerian exports to the US cheaper, raising export demand and revenue for Nigerian firms, which can boost economic growth and employment in export sectors.
- 2
- Negative impact: Imports from the US become more expensive, raising costs for Nigerian firms that use imported raw materials, which can lead to higher inflation for consumers.
- 3
- Overall conclusion: The impact depends on how responsive export and import demand are to price changes. If export demand rises sharply, the growth benefits will outweigh inflation risks, and the current account will improve.
5. Common Pitfalls
Wrong move:
Mixing up appreciation and revaluation, calling a government-led currency rise appreciation.
Why:
Appreciation only refers to market-driven value rises, while revaluation refers to deliberate policy changes under fixed exchange rates. Examiners test this distinction regularly in 1-mark definition questions.
Correct move:
Always check if the currency value change is market or policy-led, and use the correct corresponding term in your answer.
Wrong move:
Labelling FX diagram axes incorrectly, with exchange rate on the horizontal axis.
Why:
FX diagram axes follow a specific convention: the vertical axis is always exchange rate (price of the currency), and the horizontal axis is quantity of the currency. Incorrect axes cost you all diagram marks.
Correct move:
Memorise the standard FX diagram axis labels before the exam, and double-check labels before moving on from diagram questions.
Wrong move:
Only stating that exports get cheaper after a depreciation, without linking to quantity or revenue changes.
Why:
Examiners award marks for full logical chains, not partial statements. Missing steps mean you will not get full marks for 4-6 mark analysis questions.
Correct move:
Use the standard chain for all impact questions: exchange rate change β price change β quantity change β revenue/spending change β current account impact.
Wrong move:
Applying the SPICED mnemonic to a depreciated (weak) currency.
Why:
SPICED only applies to strong (appreciated) currencies, while WPIDEC applies to weak (depreciated) currencies. Mixing these up leads to incorrect impact analysis.
Correct move:
Recite the full mnemonic before applying it to any scenario to confirm you are using the right one.
Wrong move:
Stating that a depreciation always improves the current account with no qualification.
Why:
While a depreciation should theoretically improve the current account, this depends on how responsive import and export demand are to price changes. Unqualified statements lose marks in evaluate questions.
Correct move:
Add a qualifying line such as assuming demand for exports and imports is sufficiently responsive to price changes when discussing current account impacts.
6. Quick Reference Cheatsheet
Term | Definition | Key Impact |
|---|---|---|
Exchange rate | Price of one currency in terms of another | Determines relative cost of imports and exports |
Appreciation | Market-driven rise in currency value | Exports dearer, imports cheaper (SPICED) |
Depreciation | Market-driven fall in currency value | Exports cheaper, imports dearer (WPIDEC) |
Revaluation | Deliberate government rise in fixed exchange rate | Same impact as appreciation |
Devaluation | Deliberate government fall in fixed exchange rate | Same impact as depreciation |
7. Frequently Asked
What is the difference between appreciation and revaluation?
Appreciation is a market-driven rise in currency value in a floating exchange rate system. Revaluation is a deliberate policy decision by a government or central bank to raise the value of a currency in a fixed exchange rate system.
How do higher interest rates affect exchange rates?
Higher interest rates attract foreign investors seeking better returns on their savings, which increases demand for the domestic currency, leading to an appreciation of its value.
Does a depreciation always improve the current account?
A depreciation makes exports cheaper and imports more expensive, which should raise export revenue and lower import spending to improve the current account, assuming demand for imports and exports is responsive to price changes.
What's Next
Now that you have mastered exchange rate content for Edexcel IGCSE Economics 4EC1, you are ready to apply this knowledge to related global economy topics. Exchange rate changes directly impact international trade flows, balance of payments positions, and a country's macroeconomic performance, so this content is frequently tested alongside other global economy topics in Paper 2 data response questions. You should practise drawing FX diagrams under timed conditions, and writing 4-6 mark analysis answers linking exchange rate changes to current account impacts, to build exam confidence. Make sure you can distinguish between market and policy-driven currency value changes, as this is a common 1-mark definition question.