What is the impact of a fall in the value of the pound on the UK economy?

• →A currency depreciation occurs when the external value of a currency falls relative to other currencies under a floating exchange rate system, so that each unit of the pound buys fewer units of foreign currency. (WPIDEC - Weaker Pound, Imports Dearer, Exports Cheaper)
• →When the pound depreciates, UK export prices fall in foreign currency terms which increases the volume of exports sold abroad. This means that export revenues rise, increasing aggregate demand through the net trade component (X − M),
• →A positive multiplier effect on real GDP and employment is also possible here as firms operating in export-oriented sectors, such as UK manufacturing or the creative industries, may increase investment and hire additional workers, further boosting domestic incomes.
• →At the same time, import prices rise in pounds, increasing the cost of imported raw materials and consumer goods. This feeds into cost-push inflation: firms facing higher input costs pass these on through higher prices, eroding real wages and reducing consumer purchasing power.
• →Following the sharp depreciation of sterling after the 2016 EU referendum, UK CPI inflation rose to approximately 3% by 2017, driven partly by higher import costs.
• →There is a risk that sustained inflation damages business confidence and deters long-run investment. Therefore, whilst a depreciation can provide a short-run boost to aggregate demand and net exports, its long-run effect on economic growth depends critically on whether the inflationary consequences are managed effectively and whether the Marshall-Lerner condition is satisfied so that the current account actually improves.

• →The Marshall-Lerner condition: a depreciation only improves the current account if the sum of the price elasticities of demand for exports and imports exceeds one; if demand is inelastic, the current account may worsen initially.
• →The J-curve effect: in the short run, the current account typically deteriorates after a depreciation because export and import volumes adjust slowly, even though prices change immediately.
• →Cost-push inflation: rising import prices increase firms' production costs and consumer prices, reducing real incomes and potentially triggering wage-price spirals.
• →Multiplier and accelerator effects: any rise in net exports feeds into aggregate demand, which — via the multiplier — can raise national income by a greater amount, and if this stimulates investment, the accelerator effect amplifies growth further.
• →Confidence and investment: persistent currency weakness can signal economic instability, potentially reducing both domestic and foreign direct investment and undermining long-run productive capacity.

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The production possibility frontier illustrates the economy's productive capacity and the trade-off between different types of output. For this topic, the key point is whether a depreciation shifts the PPF outward over time — representing genuine long-run growth — or whether inflationary pressures and reduced investment leave the frontier static or move output inside it. Whether the short-run boost to aggregate demand translates into an outward shift of the PPF depends on whether firms use improved export revenues to fund capital accumulation and innovation.

This question tests a student's understanding of how changes in the exchange rate transmit through an open economy, affecting aggregate demand, inflation, the current account, and long-run productive potential. The core mechanism being assessed is the link between currency depreciation and macroeconomic performance, including both demand-side and supply-side consequences. This falls under Edexcel spec point 4.1.8.g, which covers the effects of exchange rate changes on the economy. Strong answers are expected to distinguish between short-run and long-run effects, evaluate the conditions under which depreciation is beneficial, and consider potential conflicts between macroeconomic objectives such as growth and price stability.

Examined 4 times across Edexcel since 2018.

Both 25-mark appearances required a diagram, making accurate diagrammatic analysis essential at the higher tariff level.

• →International Economics — understanding comparative advantage and the patterns of trade helps explain why the elasticity of demand for UK exports and imports matters so much when assessing the impact of a depreciation on the current account.