Current account, capital flows, and exchange rate adjustment
📘 21 slides + 8 questions⏱ 30 min🎯 Theme 2: The UK Economy
Learning Objectives
By the end of this lesson you will be able to…
Describe the structure of the Balance of Payments — current account (trade in goods, services, income, transfers), capital account, and financial account
Explain the UK current account deficit: causes (deindustrialisation, low savings, strong £) and consequences (benign vs concern view)
Analyse the Marshall-Lerner condition and the J-curve effect for exchange rate adjustment
Evaluate policies to correct a current account deficit — expenditure-switching, expenditure-reducing, and supply-side approaches
Structure of the Balance of Payments
What Is the Balance of Payments?
Key Definition
BALANCE OF PAYMENTS (BoP): a record of all economic transactions between residents of a country and the rest of the world over a given period. Must always balance — current account + capital account + financial account + net errors and omissions = 0. A deficit on one account must be matched by a surplus on another.
CURRENT ACCOUNT
Trade in goods (visible exports minus visible imports — UK runs large visible deficit ~£170bn/year 2022); trade in services (UK surplus — financial services, education, tourism ~£110bn/year); primary income (returns on investment — interest, dividends, wages); secondary income (transfers — foreign aid, EU contributions).
CAPITAL ACCOUNT
Relatively small — capital transfers (debt forgiveness, migrants' transfers) and acquisition/disposal of non-produced assets (patents, land).
FINANCIAL ACCOUNT
Net investment flows — FDI, portfolio investment, reserve asset changes. UK financial account surplus finances current account deficit — foreign investors buy UK assets (gilts, property, companies), offsetting the trade deficit.
UK Current Account Deficit
The UK's Persistent Deficit
UK DATA
UK has run a current account deficit almost continuously since 1984. By 2022: deficit ~£94bn (~4% of GDP). The "twin deficits": current account deficit often accompanies budget deficit (both reflect excess spending over income). Pre-Brexit: significant services surplus (financial services, insurance). Post-Brexit: services trade barriers with EU have grown.
CAUSES
Deindustrialisation → manufacturing decline → fewer exported goods → persistent visible deficit. Relatively low household savings rate → high import consumption. UK MPC higher than competitors → more spending on imports. Historically overvalued sterling reduced export competitiveness. High domestic demand.
CONSEQUENCES (BENIGN VIEW)
Deficit financed by capital inflows — foreign investors buying UK assets. Can reflect strength — foreigners want to invest in UK economy. UK has net investment income from large overseas asset base. Low real interest rates enable cheap financing.
CONSEQUENCES (CONCERN VIEW)
Persistent deficit means UK is a net debtor to the world — vulnerable to sudden stops in capital inflows ("sudden stop" crisis). Reliance on "kindness of strangers" (Mervyn King). Can crowd out domestic investment as foreigners buy UK companies. Deindustrialisation worsens long-run supply-side capacity.
A depreciation of sterling improves the current account ONLY IF the sum of price elasticities of demand for exports and imports exceeds 1 (PEDx + PEDm > 1). If demands are inelastic, depreciation worsens the current account (higher import prices, little volume adjustment).
SHORT-RUN (J-CURVE)
Immediately after depreciation, trade volumes are fixed (contracts pre-signed, consumer habits unchanged) — PEDs are inelastic. Import bill rises (each unit costs more in £); export revenue unchanged. Current account worsens.
LONG-RUN IMPROVEMENT
Over months/years, PEDs increase as: consumers switch from foreign to domestic goods; overseas buyers switch to cheaper UK exports; new trade patterns emerge. If M-L holds (PEDs > 1), current account improves. UK evidence: post-1992 devaluation and post-2016 Brexit £ fall both eventually improved trade volumes.
Policy Responses
Policies to Correct a Current Account Deficit
EXPENDITURE-SWITCHING
Policies that redirect spending from imports to domestic goods. Exchange rate depreciation (if M-L holds). Tariffs/quotas on imports (WTO constraints). Import substitution industrialisation (controversial — "infant industry" argument).
EXPENDITURE-REDUCING
Policies that reduce total spending (AD), reducing imports as a by-product. Fiscal austerity (cut G or raise T → lower AD → lower imports). Monetary tightening (raise rates → lower C and I → lower imports). Drawback: reduces output and employment alongside imports.
SUPPLY-SIDE IMPROVEMENT
Raise international competitiveness by improving productivity and quality. Education, R&D investment → better products → more exports, less import substitution needed. Long-run approach — cannot solve short-run deficit.
EVALUATION
Exchange rate depreciation: effective if M-L holds and J-curve lag is acceptable; but raises import costs → inflationary. Austerity: reduces deficit but at cost of recession. Supply-side: best long-run solution but years/decades to work. For UK: persistent structural deficit likely requires fundamental improvement in export competitiveness (manufacturing, technology exports).
Real-World Applications
BoP in the Real World
UK POST-BREXIT £ DEPRECIATION
£ fell ~15% vs EUR and USD after 2016 referendum. Should have improved current account via M-L. Evidence: visible trade deficit narrowed initially. But: services trade barriers with EU offset gains; import inflation (CPI contribution ~2pp by 2017) eroded real incomes. Net effect ambiguous.
CHINA'S CURRENT ACCOUNT SURPLUS
China ran large surplus (>10% GDP in 2007) as manufacturing exports dominated. US accused China of keeping RMB undervalued to maintain export competitiveness. WTO tensions. By 2023, China's surplus has moderated as wages rose and domestic consumption grew.
EUROZONE IMBALANCES
Germany's persistent surplus (~7% GDP) vs Spain/Portugal/Greece deficits — within a currency union, standard adjustment mechanisms (depreciation) unavailable. Required internal devaluation (wage cuts, austerity) → severe recessions in peripheral economies. Shows how BoP imbalances within currency unions create political tensions.
UK "KINDNESS OF STRANGERS"
Post-2016, UK current account funded by: foreign purchase of UK gilts, property, and companies. Risk: if capital flows reverse (e.g. loss of confidence, credit rating downgrade) → sterling falls sharply → import inflation → forced adjustment. Governor Carney's warning (2017) proved prescient with Liz Truss mini-budget market reaction (Sept 2022).
Evaluation
Evaluating BoP Policy
Reasons the deficit may be manageable
UK financial account surplus reliably finances the deficit — foreign investors continue to value UK assets (rule of law, financial depth, English language)
Services surplus partially offsets goods deficit — London's role as a global financial centre generates significant invisible earnings
A weaker £ over time may gradually improve competitiveness without requiring policy intervention
UK's large stock of overseas investments generates primary income flows that partially offset trade deficit
Reasons to be concerned
Structural deficit since 1984 suggests fundamental lack of export competitiveness — not a cyclical problem
Reliance on capital inflows makes UK vulnerable to "sudden stops" — a loss of investor confidence triggers sharp sterling fall and inflationary crisis
Post-Brexit services barriers with EU have reduced the services surplus, worsening the overall position
Persistent deindustrialisation means UK's productive capacity for traded goods continues to shrink
Essay Tip: "For AQA 25-mark essays, contrast expenditure-switching and expenditure-reducing policies, then evaluate using Marshall-Lerner and the J-curve. Always discuss trade-offs: depreciation corrects the deficit but raises inflation; austerity corrects the deficit but causes unemployment. The best conclusion weighs long-run supply-side reform against short-run adjustment costs."
Evaluation · Exchange Rate Adjustment
Does Depreciation Always Work?
WHEN DEPRECIATION HELPS
If PEDx + PEDm > 1 (M-L holds): in the long run, export volume rises (cheaper for foreigners) and import volume falls (dearer domestically). UK evidence: post-ERM exit 1992 — £ fell ~15%, exports rose, UK manufacturing recovered. Classic expenditure-switching mechanism.
WHEN DEPRECIATION FAILS
If demands are inelastic (PEDs < 1): depreciation raises import costs without sufficient volume reduction — current account worsens. UK imported commodities (energy, food) have low PED. J-curve lag means policy makers may reverse before long-run benefits arrive. Import price inflation erodes real wages.
HYSTERESIS EFFECTS
UK manufacturing that was lost due to deindustrialisation cannot easily be rebuilt — "hysteresis" in trade patterns. Even a competitive exchange rate may not revive manufacturing export capacity that no longer exists. Supply-side investment in new export industries needed alongside exchange rate adjustment.
CURRENCY UNION CONSTRAINT
Countries in a currency union (e.g., eurozone) cannot depreciate independently. Adjustment must come through "internal devaluation" — wage and price cuts to restore competitiveness. This is far more politically and economically painful, as the Greek, Spanish, and Portuguese crises demonstrated.
Glossary
Key Terms
Current Account
The component of the BoP recording trade in goods (visible), trade in services (invisible), primary income (investment returns), and secondary income (transfers). UK has run a persistent deficit here since 1984.
Visible Trade
Trade in physical goods — exports minus imports of goods. UK runs a large visible deficit (~£170bn/year in 2022) due to deindustrialisation and high consumer import spending.
Invisible Trade
Trade in services — exports minus imports of services. UK runs a services surplus (~£110bn/year) driven by financial services, education, and tourism. Partially offsets the visible deficit.
Marshall-Lerner Condition
A currency depreciation will improve the current account only if PEDx + PEDm > 1. If combined elasticities are below 1, depreciation worsens the current account (higher import costs, insufficient volume change).
J-Curve
The pattern where a currency depreciation initially worsens the current account (SR: inelastic demands, rising import bills) before improving it in the long run (LR: PEDs rise as contracts expire and consumers adjust).
Expenditure-Switching
Policies that redirect domestic spending from imports to home-produced goods — e.g. depreciation, tariffs, subsidies to domestic producers. Contrast with expenditure-reducing (AD cuts) and supply-side policies.
Question 1 of 8 · Balance of Payments
A country has a current account deficit. This means:
A
The government is spending more than it receives in tax revenue
B
The value of imports of goods, services and income flows exceeds the value of exports
C
Foreign exchange reserves are falling and the country is bankrupt
D
The financial account must also be in deficit to maintain BoP balance
Answer · Question 1
A country has a current account deficit. This means:
A
The government is spending more than it receives in tax revenue
B
The value of imports of goods, services and income flows exceeds the value of exports
C
Foreign exchange reserves are falling and the country is bankrupt
D
The financial account must also be in deficit to maintain BoP balance
Correct: B. A current account deficit means the country is spending more on imported goods, services, and income flows than it is earning from exports of the same. This is NOT the same as a budget deficit (A — that is a fiscal concept). The BoP must always balance, so a current account deficit requires a surplus on the financial/capital account (not another deficit — ruling out D). It does not automatically mean reserves are falling (C) if financed by capital inflows.
Question 2 of 8 · Balance of Payments
The Marshall-Lerner condition states that a currency depreciation will improve the current account only if:
A
The price elasticity of demand for exports exceeds 1
B
The sum of PED for exports and imports is less than 1
C
The sum of PED for exports and imports exceeds 1
D
Domestic inflation is lower than trading partners' inflation
Answer · Question 2
The Marshall-Lerner condition states that a currency depreciation will improve the current account only if:
A
The price elasticity of demand for exports exceeds 1
B
The sum of PED for exports and imports is less than 1
C
The sum of PED for exports and imports exceeds 1
D
Domestic inflation is lower than trading partners' inflation
Correct: C. The Marshall-Lerner condition: PEDx + PEDm > 1. When depreciation makes exports cheaper and imports dearer, trade volumes must respond sufficiently (combined elasticities > 1) for the current account to improve. If elasticities are low (inelastic demands), the price effects dominate — import bills rise without sufficient volume reduction, and the current account worsens. Option A is insufficient alone — both elasticities together must exceed 1.
Question 3 of 8 · Balance of Payments
The J-curve effect describes the observation that after a currency depreciation:
A
The current account immediately improves, then worsens over time
B
The current account worsens in the short run before improving in the long run
C
GDP falls sharply then recovers, tracing a J shape
D
Import volumes fall immediately, improving the current account from day one
Answer · Question 3
The J-curve effect describes the observation that after a currency depreciation:
A
The current account immediately improves, then worsens over time
B
The current account worsens in the short run before improving in the long run
C
GDP falls sharply then recovers, tracing a J shape
D
Import volumes fall immediately, improving the current account from day one
Correct: B. The J-curve: in the short run, trade volumes are sticky (existing contracts, consumer habits). Depreciation raises the price of imports in domestic currency, increasing the import bill without reducing import volume sufficiently — current account worsens. Over time (months to years), consumers and firms adjust — import volumes fall, export volumes rise. If M-L holds, the current account eventually improves, tracing a J shape on a time-series chart.
Question 4 of 8 · Balance of Payments
UK trade in services is typically:
A
In deficit, as the UK imports more services (tourism, education) than it exports
B
In surplus, driven by financial services, insurance, and education exports
C
Balanced, as services trade is less important than goods trade for the UK
D
In deficit, because the UK financial sector imports more than it exports
Answer · Question 4
UK trade in services is typically:
A
In deficit, as the UK imports more services (tourism, education) than it exports
B
In surplus, driven by financial services, insurance, and education exports
C
Balanced, as services trade is less important than goods trade for the UK
D
In deficit, because the UK financial sector imports more than it exports
Correct: B. The UK consistently runs a services surplus (approximately £110bn/year in 2022). London's position as a global financial centre generates large earnings from banking, insurance, and legal services sold to overseas clients. UK universities attract international students (invisible export). This services surplus partially offsets the large visible (goods) deficit. Post-Brexit, this services surplus has come under some pressure due to new barriers to EU-UK services trade.
Question 5 of 8 · Balance of Payments
Which of the following is an example of an expenditure-reducing policy to correct a current account deficit?
A
Imposing a 10% tariff on imported manufactured goods
B
Depreciating the exchange rate to make imports more expensive
C
Raising interest rates to reduce consumer spending and investment
D
Subsidising domestic exporters to make them more competitive
Answer · Question 5
Which of the following is an example of an expenditure-reducing policy to correct a current account deficit?
A
Imposing a 10% tariff on imported manufactured goods
B
Depreciating the exchange rate to make imports more expensive
C
Raising interest rates to reduce consumer spending and investment
D
Subsidising domestic exporters to make them more competitive
Correct: C. Expenditure-reducing policies work by cutting total aggregate demand, which reduces import spending as a by-product. Raising interest rates reduces consumption (higher borrowing costs) and investment — and since imports are a component of spending, they fall too. Options A and B are expenditure-switching (redirecting spending from imports to domestic goods). Option D is a supply-side/competitiveness measure. The drawback of C is that it reduces GDP and employment, not just imports.
Question 6 of 8 · Balance of Payments
The main structural cause of the UK's persistent current account deficit is:
A
Excessive government spending on public services which crowds out exports
B
Deindustrialisation, which eroded the UK's manufacturing export base
C
Overvalued sterling maintained artificially by the Bank of England
D
Low UK interest rates which reduce returns on UK assets, deterring foreign investment
Answer · Question 6
The main structural cause of the UK's persistent current account deficit is:
A
Excessive government spending on public services which crowds out exports
B
Deindustrialisation, which eroded the UK's manufacturing export base
C
Overvalued sterling maintained artificially by the Bank of England
D
Low UK interest rates which reduce returns on UK assets, deterring foreign investment
Correct: B. The UK's manufacturing sector declined dramatically from the 1970s onward (deindustrialisation) — at its peak, manufacturing was ~30% of GDP; today it is ~10%. This destroyed the UK's capacity to export goods in volume. The UK now imports the manufactured goods it no longer produces — cars, electronics, machinery — creating a persistent visible deficit. This structural problem cannot be quickly fixed by exchange rate changes or demand management alone; it requires rebuilding productive capacity.
Question 7 of 8 · Balance of Payments
The UK's current account deficit is consistently matched by a financial account surplus. This relationship exists because:
A
The government deliberately engineers a financial account surplus through capital controls
B
The BoP must always sum to zero — a current account deficit requires an offsetting financial account surplus
C
A financial account surplus causes the current account deficit by pulling in too much foreign capital
D
Both deficits and surpluses are independently determined and their relationship is coincidental
Answer · Question 7
The UK's current account deficit is consistently matched by a financial account surplus. This relationship exists because:
A
The government deliberately engineers a financial account surplus through capital controls
B
The BoP must always sum to zero — a current account deficit requires an offsetting financial account surplus
C
A financial account surplus causes the current account deficit by pulling in too much foreign capital
D
Both deficits and surpluses are independently determined and their relationship is coincidental
Correct: B. By definition, the Balance of Payments must sum to zero (with net errors and omissions). A current account deficit means the UK is spending more abroad than it earns — foreigners accumulate sterling which they then invest in UK assets (gilts, property, equities, FDI), creating a financial account surplus. This is an accounting identity, not a coincidence. The risk is that if foreign investors lose confidence and capital flows reverse, sterling falls sharply — the "sudden stop" scenario Governor Carney warned about.
Question 8 of 8 · Balance of Payments
In the eurozone, Greece was unable to depreciate its currency to correct its current account deficit. The alternative mechanism used was:
A
Quantitative easing by the ECB to boost Greek export competitiveness
B
Internal devaluation — cutting wages and prices to restore competitiveness relative to trading partners
C
Introducing import tariffs on German goods to reduce the bilateral deficit
D
Reintroducing the drachma and floating the exchange rate independently
Answer · Question 8
In the eurozone, Greece was unable to depreciate its currency to correct its current account deficit. The alternative mechanism used was:
A
Quantitative easing by the ECB to boost Greek export competitiveness
B
Internal devaluation — cutting wages and prices to restore competitiveness relative to trading partners
C
Introducing import tariffs on German goods to reduce the bilateral deficit
D
Reintroducing the drachma and floating the exchange rate independently
Correct: B. Within a currency union, members share a single currency and cannot depreciate independently. To restore export competitiveness, Greece (and Spain, Portugal) undertook "internal devaluation": cutting nominal wages, reducing public sector pay, lowering domestic prices. This makes exports cheaper in real terms (equivalent to depreciation) but at enormous human cost — Greek unemployment hit 27% (2013), GDP fell ~25% from peak. This illustrates why BoP adjustment within currency unions is far more painful than for countries with floating exchange rates.
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Lesson Complete
You've covered the structure of the Balance of Payments, the UK current account deficit and its causes, the Marshall-Lerner condition, J-curve effect, policies to correct the deficit, and real-world applications including Brexit, China, and the eurozone.
Always define current account clearly (not just "trade deficit"). State Marshall-Lerner condition precisely: PEDx + PEDm > 1. Distinguish expenditure-switching from expenditure-reducing — examiners reward precise categorisation. Define J-curve as the short-run worsening before long-run improvement.
DRAW THE DIAGRAMS
Draw a J-curve for any question about depreciation effects. Label: x-axis (time), y-axis (current account balance), depreciation point, SR worsening, LR improvement. For 25-mark essays, a clear diagram with explanation scores high marks even if the written analysis is otherwise sound.
EVALUATE, DON'T JUST DESCRIBE
For any policy: state the condition under which it works, then the condition under which it fails. Depreciation works if M-L holds but worsens inflation. Austerity reduces deficit but at cost of recession. Supply-side is best long-run but takes decades. Reaching a reasoned conclusion scores level 4.
USE UK CONTEXT
AQA examiners reward application to UK data: UK deficit ~4% GDP (2022); visible deficit ~£170bn; services surplus ~£110bn; deficit financed by financial account inflows; post-Brexit £ depreciation; 2022 mini-budget sterling crisis. Specific examples lift generic analysis to top marks.