A country buying more from abroad than it sells must be paying for the difference somehow: borrowing, selling assets, or running down reserves. There is no other possibility, because every transaction has two sides. That accounting truth is the whole of the balance of payments, and it is why a current account deficit is never a standalone fact. It always has a counterpart, and the interesting question is what that counterpart is and whether it can continue.
Balance of payments
A record of all financial transactions between the residents of a country and the rest of the world over a period of time, usually a year.
The current account has four components and questions expect all four. Trade in goods records exports and imports of physical products, sometimes called visible trade. Trade in services records exports and imports of services such as tourism, banking, insurance and shipping, sometimes called invisible trade. Primary income records wages, interest, profits and dividends flowing in and out, so a country whose firms own assets abroad receives inflows here. Secondary income records transfers with nothing given in return, such as foreign aid and money sent home by workers abroad.
Data-response questions routinely give the four components and ask for the current account balance, or give three and the total and ask for the missing one. Set them out in a column with signs, inflows positive and outflows negative, and add. The commonest error is treating the trade in goods balance as the current account balance, when it is only one of four parts and a country with a goods deficit can have a current account surplus.
Calculating the current account balance from its components
A country records: exports of goods $180bn, imports of goods $220bn, exports of services $95bn, imports of services $60bn, net primary income minus $12bn, net secondary income plus $8bn. Calculate the trade in goods balance, the trade in services balance and the overall current account balance.
A current account deficit arises for identifiable reasons. Domestic goods may be uncompetitive because costs or prices are high, quality is poor, or the exchange rate is strong. Rapid domestic growth pulls in imports as incomes rise. A recession in export markets reduces demand for what the country sells. Structural weakness, such as a narrow export base or dependence on a single commodity, leaves a country exposed. And high domestic inflation relative to competitors erodes competitiveness year after year.
A persistent deficit matters, though not always urgently. It must be financed by borrowing from abroad or by selling domestic assets, and both create future obligations: interest to be paid or profits to be repatriated, which worsen the primary income balance later. It can indicate a loss of competitiveness that will cost jobs in export industries. It may put downward pressure on the currency. And if lenders lose confidence, financing can stop suddenly. Against that, a deficit caused by importing capital equipment for investment builds future capacity, and a deficit financed by long-term inward investment is far safer than one financed by short-term borrowing.
A current account deficit or surplus also affects the rest of the economy. A deficit means more spending leaks abroad on imports than comes in from exports, which reduces total demand, so GDP and employment are lower than they would otherwise be, but it also eases inflation, since imports add to the supply of goods. A persistent deficit tends to push the exchange rate down. A surplus works the other way: higher demand for exports raises GDP and employment, but can add to inflationary pressure and push the exchange rate up, which eventually makes exports less competitive. A surplus also means the country is lending to or investing in the rest of the world, and a very large one means its own people are consuming less than they produce.
Governments have several policies to achieve a more stable current account. Contractionary fiscal and monetary policy reduce total spending, including spending on imports, but at the cost of lower growth and higher unemployment. Protection, such as tariffs and quotas, reduces imports directly, but raises prices and invites retaliation. A fall in the exchange rate, whether allowed or encouraged, makes exports cheaper and imports dearer. Supply-side policies that raise productivity and quality make the country's goods more competitive, which is the only lasting answer to a deficit caused by weak competitiveness, but they take years to work.
A country has a deficit on trade in goods of $50bn and a surplus on trade in services of $70bn. Net primary and secondary income are both zero. The current account is:
Which situation makes a current account deficit least worrying?
The accounts and why they balance
The balance of payments as a whole always balances, as an accounting identity rather than an economic result. The current account records trade and income. The capital account is small and records transfers of capital assets such as debt forgiveness. The financial account records transactions in assets: direct investment, portfolio investment, other investment such as bank lending, and changes in official reserves. A current account deficit means a country is spending more abroad than it earns, so it must be receiving a net inflow of finance in return, which appears as a financial account surplus of the same size. The two are two views of the same set of transactions, which is why any residual is called a balancing item and reflects measurement error rather than a genuine gap.
That identity has a consequence worth stating explicitly, because it reframes most deficit questions. A current account deficit is necessarily matched by a financial account surplus, meaning foreigners are acquiring claims on the domestic economy. Whether that is benign or dangerous depends entirely on the composition. Long-term foreign direct investment building factories is very different from short-term portfolio flows that can reverse in days, even though both finance the same deficit. Judging a deficit by its size alone, without asking how it is financed, is the commonest weakness in answers on this topic.
Policies to correct a deficit fall into three families and each has a characteristic cost. Expenditure switching aims to shift spending from foreign to domestic goods, through depreciation, tariffs or quotas, or supply-side measures improving competitiveness. Expenditure reducing aims to cut total spending, through contractionary fiscal or monetary policy, so that imports fall along with everything else. Supply-side policy raises productivity and quality so that domestic goods compete better, which is the only approach that does not require either a weaker currency or lower domestic demand. The first two work faster and the third is the only one that addresses the cause.
Why deflating the economy corrects a deficit at a high price
- The government raises taxes or interest rates to reduce aggregate demand.
- Household disposable income and firms' investment both fall, so total spending declines.
- Since a proportion of all spending goes on imports, import volumes fall as spending falls.
- The current account improves, because imports have dropped while exports are unaffected in the short run.
- But the fall in demand also reduces demand for domestically produced goods, so output falls.
- Firms respond by cutting output and employment, and unemployment rises.
- The deficit has been reduced by making the country poorer rather than by making it more competitive, so the improvement disappears as soon as demand recovers.
Step 7 is the evaluation. Expenditure reducing treats the symptom: it works reliably and quickly, and it does nothing about the underlying competitiveness that caused the deficit. That is why it is a stabilisation measure rather than a solution.
Practise this chain →Draw an AD/AS diagram showing contractionary policy shifting AD left, and mark the fall in real output and the price level. Beside it, draw a foreign exchange market showing a depreciation. Annotate which components of the current account each policy affects and by what route.
Drawing both together makes the trade-off visible. Deflation improves the current account by suppressing imports through lower income, at the cost of output and jobs. Depreciation improves it by changing relative prices, at the cost of higher import prices and therefore inflation. Neither is free, and identifying which cost matters more in the circumstances given is the judgement examiners want.
A country runs a current account deficit of $30bn. Assuming the capital account is zero and measurement is accurate, the financial account must show:
Whether depreciation actually works
Depreciation makes exports cheaper in foreign currency and imports dearer in domestic currency, but whether the current account improves depends on how much quantities respond. Immediately after a depreciation, prices have changed and quantities have not: contracts are already signed, orders already placed and consumers have not yet switched suppliers. The country therefore pays more for the same volume of imports while receiving less for the same volume of exports, and the current account gets worse before it gets better. The Marshall-Lerner condition states the requirement precisely: a depreciation improves the current account only if the sum of the price elasticities of demand for exports and imports exceeds one.
PEDexports + PEDimports > 1 (in absolute terms) for a depreciation to improve the current accountElasticities are low in the short run, when contracts and habits are fixed, and rise over time as buyers adjust. This is why the condition typically fails immediately after a depreciation and holds after a year or two, which is exactly what generates the J-curve.
Testing the Marshall-Lerner condition before and after adjustment
Immediately after a depreciation, a country's PED for exports is 0.3 and for imports is 0.4. Two years later they are 0.9 and 0.8. Apply the Marshall-Lerner condition in each period and describe the path of the current account.
Draw the J-curve with the current account balance on the vertical axis, zero marked, and time on the horizontal axis. Mark the moment of depreciation, the initial deterioration, the trough, and the subsequent improvement to a position better than the starting point.
Two details separate a good diagram from a vague one. Mark the point of depreciation on the time axis, since the curve only begins its descent there. And show the final position above the starting level, not merely back to it, because otherwise the diagram implies the depreciation achieved nothing. The depth and length of the trough depend on how quickly elasticities rise.
Correcting a deficit in a developing economy is harder for reasons that should be named specifically. Exports are often concentrated in primary commodities whose prices are volatile and whose demand is income inelastic, so export earnings fluctuate and grow slowly. Imports are dominated by capital equipment, fuel and food, all of which have inelastic demand and cannot easily be cut without damaging growth or welfare, which weakens the Marshall-Lerner condition from both sides. Foreign currency debt means depreciation raises the domestic cost of servicing debt just as the trade position is meant to be improving. And limited manufacturing capacity means the supply response to cheaper exports may simply not exist.
Applied context
Persistent global imbalances since the 1990s show that large current account positions can be sustained far longer than the textbook suggests. Several economies ran current account deficits of substantial size for decades, financed by capital inflows from surplus economies willing to accumulate their assets, without the currency collapse or forced adjustment simple models predict. The counterpart surpluses reflected high savings rates rather than any adjustment failure. The episode is a caution against treating any deficit as automatically unsustainable, and equally a caution about complacency, since the abrupt reversals that have occurred elsewhere show that willingness to finance can change quickly.
Use this to argue that sustainability depends on the willingness of foreigners to hold the country's assets, not on the size of the deficit alone. That reframing is the strongest evaluative move available on this topic.
The balance of payments connects the external and domestic economies. It is the accounting counterpart of the circular flow, where imports are a withdrawal and exports an injection, so the marginal propensity to import determines both the multiplier and the deficit's response to growth. Exchange rates determine competitiveness and are the main expenditure-switching instrument. Fiscal and monetary policy operate as expenditure reducing, and a fiscal expansion worsens the current account through the import channel. Protectionism is expenditure switching by another route. And the external constraint limits how fast an economy can grow, which is why the current account appears in almost every policy conflict question.
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Discuss whether depreciation of the exchange rate is the most effective way to correct a persistent current account deficit. (13 marks)
- Define and frameDefine the current account and depreciation, and stress the word persistent, since a structural deficit implies a competitiveness problem rather than a temporary shock. State that effectiveness will be judged on whether the improvement lasts, and that the answer turns on elasticities, on the cause of the deficit and on the alternatives available.
- Analysis: the case for depreciationRun the expenditure-switching mechanism: exports cheaper abroad, imports dearer at home, volumes adjust, net exports rise. Note that it requires no fall in domestic demand, unlike deflation, so output and employment are supported rather than sacrificed. Under a floating rate it happens automatically in response to a deficit, which is an advantage over any policy requiring a decision.
- Analysis: why it may not workApply Marshall-Lerner and the J-curve: the improvement requires elasticities summing above one, which typically fails in the short run, so the account worsens first. Dearer imports raise costs and inflation, which erodes the real depreciation and can leave competitiveness unchanged, as the real exchange rate calculation shows. Trading partners may retaliate or depreciate in turn. Foreign currency debt becomes dearer to service. And a supply response requires spare capacity that may not exist.
- Analysis: the alternativesTake both seriously. Expenditure reducing works reliably and fast but at the cost of output and jobs, and the improvement reverses when demand recovers. Protectionism switches expenditure without the inflation, but invites retaliation and protects inefficiency. Supply-side policy raising productivity and quality is the only approach that addresses a persistent deficit's cause, but it takes years and costs money.
- JudgementConclude conditionally. Depreciation is most effective where elasticities are high, spare capacity exists, foreign currency debt is limited and the deficit reflects price uncompetitiveness. It is weak where demand is inelastic, the import share is high so inflation erodes the gain, or the deficit is structural. For a genuinely persistent deficit the honest conclusion is that depreciation buys time while supply-side improvement is what corrects it, and that the two are complements rather than rivals.
The strongest single move is the real exchange rate point: a nominal depreciation that feeds into domestic inflation delivers no lasting competitive gain, so depreciation cannot by itself solve a problem caused by persistently higher inflation than competitors.
Does a current account deficit matter?
- The case that it does: it must be financed, and financing creates future obligations through interest and profit repatriation that worsen the primary income balance later, so today's deficit makes tomorrow's harder to close. It may also signal deteriorating competitiveness that will eventually cost jobs.
- Against that, the identity means a deficit is simply the counterpart of a capital inflow, and inward investment that builds productive capacity is a benefit rather than a problem. A country importing machinery to expand its export industries is doing something sensible that shows up as a deficit.
- Composition of the financing matters more than the size of the deficit. Long-term direct investment is stable and productive; short-term portfolio flows can reverse within days, and a sudden stop forces abrupt and painful adjustment regardless of how modest the deficit looked.
- The exchange rate regime changes the stakes entirely. Under a float the rate adjusts and the deficit is partly self-correcting; under a fixed rate or inside a currency union it cannot, so imbalances accumulate until they are resolved by internal deflation, which is far more painful.
- Sustainability is about willingness to finance rather than any threshold figure. Deficits of similar size have persisted for decades in some economies and triggered crises in others, and the difference lies in the confidence of those holding the claims.
- The strongest answers refuse to answer in the abstract and specify: judge a deficit by its cause, by what the borrowing funds, by how it is financed and by the exchange rate regime, rather than by whether it exceeds some percentage of GDP.
Two moves recover marks reliably. When a question asks whether a deficit is a problem, invoke the identity early: the deficit is matched by a financial account surplus, so the real question is what kind of capital is flowing in. And when depreciation is proposed, always raise Marshall-Lerner and the J-curve together, since the condition explains why the J-curve has the shape it does and using both shows you understand the link rather than having memorised two terms.