A currency move reaches the shops within months but reaches export orders much later. This page shows how exchange rate changes feed into inflation, competitiveness and the current account.
Why does a weaker pound make my holiday expensive but UK exports cheap, and which effect matters more for the economy?
A fall in a currency's value makes imports dearer and exports cheaper abroad. Prices rise quickly through imported goods and inputs, but export volumes respond slowly. So inflation often worsens first and the current account improves later, if demand is elastic enough. Large swings also raise uncertainty, which hurts trade and investment.
The exchange rate is the price of one currency in terms of another. On a floating exchange rate (one set by supply and demand in the foreign exchange market), a fall in value is a depreciation and a rise is an appreciation. A devaluation is a deliberate fall under a fixed or managed rate.
Volatility means large and unpredictable swings in the rate. A one-off move and a volatile rate have different effects, so keep them apart in your answers.
A currency move works through three channels. Each one links to a different macroeconomic objective.
Illustrative figures: suppose the pound falls from $1.30 to $1.20. That is a fall of 7.7%. A US good priced at $100 now costs £83.33 instead of £76.92, a rise of 8.3%. So the import price in pounds rises by more than the pound falls, because the percentage is taken from a lower base.
Import prices change almost at once. Firms and households cannot switch supplier or product that quickly, because contracts are fixed and habits are slow to change. So in the short run, demand for imports and exports is inelastic.
Over time, buyers find substitutes and exporters win new orders. Elasticity rises, so quantities respond more. This is why the trade balance can worsen first and then improve. The path is the J-curve.
The Marshall-Lerner condition is the test. If the elasticities sum to more than 1 in the long run, the curve ends above its starting point. If not, the current account stays worse.
The inflation effect runs the other way in an appreciation. Imports become cheaper, which lowers cost-push pressure (inflation caused by rising costs). Exporters lose price competitiveness, so net exports and aggregate demand (AD, total planned spending) may fall.
Draw the J-curve with the time axis labelled. Mark the date of the depreciation, the trough and the later improvement. Say why each part happens.
Exchange rate pass-through is the degree to which a currency move is passed on to import prices and then consumer prices. Evidence from the UK shows it is strong at the border and weaker at the till.
After the 2015 to 2016 fall in sterling, the Office for National Statistics (ONS, the UK statistics agency) found large rises in import and input inflation, then smaller rises in producer and consumer prices.[1] So firms absorbed some of the cost, or passed it on slowly.
The Bank of England (BoE, the UK central bank) has used rough rules of thumb. It multiplies import-price pass-through of 60% to 90% by the import share of the consumer basket.[2] A more import-intensive economy therefore sees a bigger inflation effect.
Volatility has its own costs. Firms cannot price contracts with confidence, so some cut trade or investment. Others pay for hedging (fixing a future exchange rate in advance, for example with a forward contract), which raises costs. Large firms hedge more easily than small ones.
Policy can respond. The central bank may raise interest rates to hold back imported inflation, which can also support the currency. But higher rates slow growth, so the response has a cost. Judge the weight of each channel for the economy in the question.
Most lost marks come from treating the effects as instant, automatic or one-sided.
Fix these by naming the elasticity, the time lag and the type of exchange rate system in each answer.
The economics is the same on every board; the question format is what changes. Most questions on this topic take one of six shapes. Open each to see how the topic appears in it and what earns the marks. All questions here are original Curriculum Circle practice questions, not board questions.
On this topicCommon. Expect questions on the direction of effects, the Marshall-Lerner condition and the definition of pass-through.
What earns the marksAO1 for definitions and AO2 for a short application to numbers.
CC practice questionA country's exchange rate depreciates. Which one of the following is most likely in the short run? A The current account improves B Import prices rise C Export volumes rise sharply D Inflation falls (1 mark)
On this topicFairly common. You may calculate a percentage change in the rate, an import price in domestic currency or a sum of elasticities.
What earns the marksAO1 for the method and AO2 for applying it, then a short interpretation.
CC practice questionIllustrative figures: the pound falls from $1.25 to $1.10. Calculate the pound price of an American machine priced at $55,000 before and after the change, and the percentage rise. (3 marks)
On this topicCommon. Typical prompts ask you to explain why a depreciation raises inflation, or why the current account may not improve.
What earns the marksAO1 for knowledge, AO2 for context and AO3 for a developed chain of reasoning.
CC practice questionExplain two ways in which a fall in the value of the pound could affect UK inflation. (6 marks)
On this topicVery common. Draw a J-curve, or an AD and AS diagram showing a rise in AD from net exports alongside a leftward shift in short-run aggregate supply (SRAS) from dearer imported inputs.
What earns the marksAO2 for using the diagram and data, and AO3 for a chain of reasoning with a clear sequence.
CC practice questionUsing a diagram, analyse how a depreciation of the pound might affect the UK current account over time. (9 marks)
On this topicCommon. You may be given an extract on a falling currency and asked to judge a policy response.
What earns the marksAO3 for analysis and AO4 for a supported judgement on the size and timing of effects.
CC practice questionEvaluate whether a central bank should raise interest rates in response to a sharp fall in its currency. (12 marks)
On this topicRegular. The essay usually asks whether a weaker currency benefits the economy, or how far volatility harms it.
What earns the marksAO1 to AO3 in the main body, and AO4 for a clear, justified conclusion that decides the top band.
CC practice question'A weaker currency is good for an economy.' Discuss. (25 marks)
| Weight | What it is | What it means on currency volatility and the macroeconomy | |
|---|---|---|---|
| AO1 | 20–23% | Knowledge and understanding of terms, concepts, theories and models | State what depreciation, pass-through and the Marshall-Lerner condition mean, and give the correct direction of each effect. |
| AO2 | 26–29% | Application to economic contexts | Use the context given, such as the trade mix, import share or size of the move, and calculate with the figures supplied. |
| AO3 | 26–29% | Analysis of issues and their impact on economic agents | Build chains such as weaker currency, dearer imports, higher costs, higher inflation, and a lagged rise in export volumes. |
| AO4 | 22–25% | Evaluation, using evidence to reach a judgement | Weigh the effects by elasticity, time lag, spare capacity and the cause of the move, then give a judgement that follows from your reasoning. |
Weightings are approximate and taken from the AQA A-level Economics 7136 specification [0]. Edexcel and IAL weight the objectives differently, but they test the same four skills.
Discuss whether a fall in the value of the pound will improve the UK's macroeconomic performance. (25 marks)
A weaker pound lowers the foreign-currency price of UK exports and raises the pound price of imports. So export demand rises and import demand falls, which lifts net exports and AD. If the economy has spare capacity, output and employment rise.
At the same time, dearer imported fuel, food and components raise firms' costs. SRAS shifts left, so the price level rises. Real incomes fall if wages lag prices, which cuts consumer spending.
The current account may worsen first. Demand for both is inelastic in the short run, so the import bill rises while volumes barely change. This is the J-curve.
The net effect depends on three things. First, the Marshall-Lerner condition: if elasticities are low, the current account does not improve. Second, import intensity: a UK exporter using imported parts gains less, and the rise in the cost of living is larger. Third, time: price effects arrive in months, while volume gains take a year or more.
The evidence points the same way. After the 2015 to 2016 fall, input inflation jumped but consumer price rises were smaller.[1] So the inflation cost was real but limited.
On balance, a fall helps if spare capacity exists and exporters can scale up, so it can support growth over a few years. It harms performance if the economy is near full capacity or the fall reflects lost confidence. The short-run price rise is more certain than the long-run gain, so the case for benefit is conditional rather than general.
After the 2015 to 2016 depreciation of sterling, the ONS found large rises in import and input price inflation. Producer and consumer price rises were more muted.[1]
In a 2015 speech, the Bank of England described a rule of thumb for UK prices. Pass-through to import prices of 60% to 90% is multiplied by the import share of the consumer price basket.[2]
A Centre for Economic Performance (LSE) paper studied consumer prices after the 2016 Brexit referendum. It reports aggregate pass-through of about 0.15 to 0.29 for the UK, depending on the method.[3]
Everything above is the topic page. The pieces below take it further. Each one trains a particular assessment objective rather than covering the topic again, and they are added over the year.
Figures and facts were checked against these sources on 2 November 2026. Worked numbers labelled "Illustrative figures" are invented for teaching.
The CC Economics revision platform drills this topic with J-curve and pass-through questions, and the Inner Academy covers it in recorded lessons.
See the Economics platformThe Inner Academy