What are exchange rates and why are they important in the global economy?

Exchange rates are the value of one currency for the purpose of conversion to another. They are crucial in the global economy as they affect international trade, investment, and travel. A change in exchange rates can influence the competitiveness of a country's goods and services, impacting economic growth and inflation.

How do floating and fixed exchange rate systems differ?

In a floating exchange rate system, the value of a currency is determined by market forces without direct government or central bank intervention. In contrast, a fixed exchange rate system pegs a currency's value to another currency or a basket of currencies, with the government or central bank maintaining the rate through interventions. Each system has its advantages and disadvantages, affecting economic stability and policy flexibility.

What factors influence exchange rates in the global market?

Exchange rates are influenced by various factors including interest rates, inflation, political stability, economic performance, and market speculation. For instance, higher interest rates offer lenders a higher return relative to other countries, attracting foreign capital and causing the currency to appreciate.

How do exchange rates impact international trade?

Exchange rates directly affect the price of goods and services in international trade. If a country's currency appreciates, its exports become more expensive and imports cheaper, potentially reducing export competitiveness. Conversely, a depreciating currency can boost exports by making them cheaper on the global market, but increase the cost of imports, affecting trade balances.

What role do central banks play in managing exchange rates?

Central banks can influence exchange rates through monetary policy and direct intervention. They may adjust interest rates to control inflation and stabilize the currency. In a fixed exchange rate system, central banks actively buy or sell their currency to maintain the pegged rate. These actions are crucial for maintaining economic stability and achieving macroeconomic objectives.

Why is "Using 'devaluation' for floating currency depreciation." a common mistake in Exchange Rates?

Why it happens: Similar terms. How to avoid it: Devaluation = DELIBERATE downward adjustment under a fixed/managed regime. Depreciation = market-driven fall under floating.

Why is "Saying depreciation makes imports cheaper." a common mistake in Exchange Rates?

Why it happens: Reversed direction. How to avoid it: Depreciation makes imports MORE EXPENSIVE (need more of own currency to buy foreign goods).

The Global EconomyIB Economics SL

Exchange Rates

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Exchange Rates — IB Economics SL: floating exchange rates, appreciation/depreciation, determinants, effects

Unit 4.5 of the 2022+ syllabus. Floating exchange rates determined by demand and supply of currency. Major determinants include trade, capital flows, interest rates, expectations.

What you’ll learn

Mapped to the IB DP Economics SL subject guide (2022 onwards (first assessment May 2024)).

4.5.1 — Define exchange rate.
4.5.2 — Distinguish appreciation and depreciation.
4.5.3 — Identify determinants of currency demand and supply.

Exchange rates and what moves them

Supply and demand for currency.

Exchange rate = price of one currency expressed in another.

$1 = €0.92.
£1 = $1.27.

Floating exchange rate = determined by market forces (demand + supply).

Appreciation = currency rises in value. £1 was $1.20; now £1 =$ 1.30. Pound has appreciated against dollar.

Imports become CHEAPER for domestic consumers.
Exports more EXPENSIVE for foreigners.

Depreciation = currency falls in value. £1 was $1.30; now £1 =$ 1.20. Pound has depreciated.

Imports more EXPENSIVE.
Exports CHEAPER abroad → exports often rise.

Demand for a currency comes from:

Exports of goods and services (foreigners need £ to buy UK goods).
Capital inflows — FDI, portfolio investment in domestic assets.
Speculation — traders expecting appreciation buy now.
Tourism — foreign tourists exchange their currency for ours.

Supply of a currency comes from:

Imports (domestic firms/consumers need foreign currency).
Capital outflows — domestic investors buying foreign assets.
Domestic tourism abroad.

Equilibrium exchange rate where demand = supply.

Determinants (factors shifting D or S):

Factor	Effect on demand for £
Higher UK interest rates	Capital inflows ↑ → D ↑ (appreciation)
Higher UK growth	Investment opportunities ↑ → D ↑
Higher UK inflation	Real returns ↓ → D ↓ (depreciation)
Political stability	Confidence ↑ → D ↑
Expected appreciation	Speculation buys → D ↑

Real-world dynamics:

Short-term: dominated by capital flows + speculation (volatile).
Long-term: tends toward purchasing power parity (PPP) — currencies adjust to equalise real purchasing power.
Central bank actions (rate changes) trigger immediate exchange rate response.

Exchange rate = price of currency.
Appreciation: rises; depreciation: falls.
D: exports, capital in, speculation.
S: imports, capital out, savings abroad.
Determinants: rates, growth, inflation, politics.

How it’s examined

Paper 1: 'Explain how an increase in UK interest rates affects the value of the pound.' Paper 2: identify cause of currency movement from data.

Sources: IB Diploma Programme Economics subject guide (IBO, 2020 — first assessment 2022). Last reviewed 2026-05-31.

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Step-by-step worked examples — Exchange Rates

Step-by-step solutions to past-paper-style questions on exchange rates, written exactly the way a tutor would explain them at the board.

1Interest rate effect on currency
Building confidence• determinants
Question
Explain how a rise in UK interest rates affects the value of the pound. (3 marks)
Step-by-step solution
1. Step 1
  Higher UK rates attract financial capital from abroad seeking higher returns.
2. Step 2
  Demand for £ rises in the foreign exchange market.
3. Step 3
  £ appreciates against other currencies — UK exports become more expensive, imports cheaper.
Answer
Higher rates → capital inflows → demand for £ up → appreciation.
2Depreciation effect on trade
Stretch• depreciation
Question
Discuss the effect of a 10% depreciation of a currency on the current account. (5 marks)
Step-by-step solution
1. Step 1
  Exports become CHEAPER abroad → demand for exports rises → export REVENUE may rise.
2. Step 2
  Imports become MORE EXPENSIVE → demand for imports falls → import VALUE may fall.
3. Step 3
  Marshall-Lerner condition: if combined PED for exports + imports > 1, depreciation improves current account.
4. Step 4
  J-curve effect: short-run worsening (volumes adjust slowly), long-run improvement.
5. Step 5
  Side effects: higher imported inflation; raised cost of foreign debt; capital flight risk if expected to continue.
Answer
Boosts exports / cuts imports if Marshall-Lerner holds; J-curve short-run worsening; imported inflation risk.
3Currency expectations
Stretch• expectations
Question
Explain how expectations of future currency movements can cause real movements today. (3 marks)
Step-by-step solution
1. Step 1
  If traders expect £ to APPRECIATE tomorrow, they buy £ today (to profit when it rises).
2. Step 2
  Increased current demand → £ appreciates immediately.
3. Step 3
  Self-fulfilling: expectation drives the very movement expected. Also vulnerable to herd behaviour and speculative bubbles.
Answer
Speculation today on expected future movements drives current rate — self-fulfilling dynamics.

Key Definitions and Keywords — Exchange Rates

Definitions to memorise and the exact keywords mark schemes credit for exchange rates answers — sharpened from recent examiner reports for the 2026 IB DP Economics SL sitting.

Exchange rate
Examiner keyword
Price of one currency in terms of another.
Appreciation
Examiner keyword
Rise in the value of a floating currency relative to others.
Depreciation
Examiner keyword
Fall in the value of a floating currency relative to others.

Common Mistakes and Misconceptions — Exchange Rates

The traps other students keep falling into on exchange rates questions — taken from recent IB DP Economics SL examiner reports and mark schemes — and how to avoid them.

✕Using 'devaluation' for floating currency depreciation.
Why it happens
Similar terms.
How to avoid it
Devaluation = DELIBERATE downward adjustment under a fixed/managed regime. Depreciation = market-driven fall under floating.
✕Saying depreciation makes imports cheaper.
Why it happens
Reversed direction.
How to avoid it
Depreciation makes imports MORE EXPENSIVE (need more of own currency to buy foreign goods).

Past paper style quiz

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Exchange Rates — frequently asked questions

The things students keep getting wrong in this sub-topic, answered.

Exchange Rates

Short Study Notes in the form of Slides

Short Study Notes — Exchange Rates

Detailed Notes

What you’ll learn

How it’s examined

1Interest rate effect on currency

2Depreciation effect on trade

3Currency expectations

Exchange rate

Appreciation

Depreciation

✕Using 'devaluation' for floating currency depreciation.

✕Saying depreciation makes imports cheaper.

Past paper style quiz

Exchange Rates — frequently asked questions