In simple terms
A friendly intro before the formal notes — no formulas yet.
Recording international flows
The current account records trade in goods and services plus primary and secondary income. (X − M) is a component of AD.
The current account is like a country's bank statement for international dealings — credits from selling abroad and income earned overseas, debits from buying imports and payments sent abroad.
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Balance of trade = exports of goods − imports of goods.
- 2
Services: tourism, shipping, financial services.
- 3
Deficit: more spending abroad than income from abroad.
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Financed by capital/financial account inflows (or reserves).
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Current account = trade in goods + services + primary + secondary income
Current account = trade in goods + services + primary + secondary income.
Key formulas
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At a glance — side by side
Compare key properties side by side — ideal for exam contrasts.
Comparing a Current Account Surplus and Deficit
| Feature | Current Account Surplus | Current Account Deficit |
|---|---|---|
| Definition | The sum of credits (inflows) is greater than the sum of debits (outflows). | The sum of debits (outflows) is greater than the sum of credits (inflows). |
| Impact on (X-M) | Likely to be positive, as X > M is a common cause. | Likely to be negative, as M > X is a common cause. |
| Effect on Aggregate Demand (AD) | Acts as a net injection into the circular flow, shifting AD to the right. | Acts as a net leakage/withdrawal from the circular flow, shifting AD to the left. |
| Typical Macroeconomic Impact | Higher economic growth and employment, but potential demand-pull inflation. | Slower economic growth and higher unemployment, but lower inflationary pressure. |
| Implication for Foreign Assets | The country is a net lender to the rest of the world, building up its net foreign asset position. | The country is a net borrower from the rest of the world, running down its net foreign asset position or increasing its liabilities. |
| Pressure on Exchange Rate | Creates upward pressure (appreciation) due to higher demand for the domestic currency to buy exports. | Creates downward pressure (depreciation) due to higher supply of the domestic currency to buy imports. |
Definition
Current Account Surplus
Current Account Deficit
Impact on (X-M)
Current Account Surplus
Current Account Deficit
Effect on Aggregate Demand (AD)
Current Account Surplus
Current Account Deficit
Typical Macroeconomic Impact
Current Account Surplus
Current Account Deficit
Implication for Foreign Assets
Current Account Surplus
Current Account Deficit
Pressure on Exchange Rate
Current Account Surplus
Current Account Deficit
Full topic notes
Formal explanation with the rigour you need for the exam.
The Structure of the Current Account
The current account is a major component of a country's balance of payments, recording all transactions of a 'current' nature between its residents and the rest of the world. It is a measure of the international flow of funds from trade and income. The account is broken down into four key sub-sections: the balance of trade in goods (visible trade), the balance of trade in services (invisible trade), net primary income, and net secondary income. Each transaction is recorded as either a credit (an inflow of money into the country, e.g., from exports) or a debit (an outflow of money, e.g., for imports). The overall current account balance is the sum of the balances of these four components.
Records the flow of money from trade in goods and services, plus income flows.
Credits represent inflows of foreign currency, while debits represent outflows.
Comprises four components: trade in goods, trade in services, primary income, and secondary income.
The final balance is a key indicator of a country's external economic health.
Components 1 & 2: The Balance of Trade
The balance of trade is typically the largest part of the current account. It is split into two categories. The trade in goods balance (or visible balance) records the import and export of tangible products like cars, oil, and machinery. The trade in services balance (or invisible balance) records the import and export of intangible services such as tourism, financial advice, and shipping. A country has a trade surplus if the value of its exports of goods and services exceeds the value of its imports. Conversely, a trade deficit occurs when imports are greater than exports. For many economies, the performance of the trade balance is the primary determinant of the overall current account position.
Trade in Goods (Visibles): Exports and imports of physical items.
Trade in Services (Invisibles): Exports and imports of non-physical services.
The Balance of Trade = (Value of Goods Exports + Value of Services Exports) – (Value of Goods Imports + Value of Services Imports).
A trade deficit is a negative balance of trade; a surplus is a positive balance.
Components 3 & 4: Primary and Secondary Income
Primary income (or net investment/factor income) is the flow of money generated from owning and loaning factors of production. It includes wages, profits, interest, and dividends earned from assets held abroad (credits) minus those paid to foreign owners of domestic assets (debits). For example, dividends paid by a UK company to a shareholder in the USA is a debit. Secondary income (or net current transfers) involves one-way payments where no good, service, or factor of production is exchanged. This includes payments like government contributions to international organisations, foreign aid, and remittances sent home by migrant workers. Both are recorded as 'net' flows, representing the difference between inflows and outflows.
Primary Income: Income earned from cross-border investments and employment (e.g., profits, dividends, interest).
Secondary Income: Unilateral transfers with no economic return (e.g., foreign aid, remittances).
A credit on the primary income account would be profits returning to the UK from a UK-owned factory in Poland.
A debit on the secondary income account would be the UK government sending aid to another country.
The Current Account's Impact on Aggregate Demand
The current account balance has a direct impact on a country's aggregate demand (AD). The AD formula is AD = C + I + G + (X-M), where (X-M) represents net exports of goods and services. A current account surplus, often driven by X being greater than M, means (X-M) is a positive figure. This acts as a net injection into the circular flow of income, shifting the AD curve to the right. This can lead to higher real GDP, lower unemployment, and potentially demand-pull inflation. Conversely, a current account deficit means (X-M) is negative, representing a net leakage from the circular flow. This shifts AD to the left, which can dampen economic growth and increase unemployment.
The balance of trade (X-M) is a component of Aggregate Demand.
A current account surplus (or a fall in a deficit) increases AD, shifting the curve rightwards.
A current account deficit (or a fall in a surplus) decreases AD, shifting the curve leftwards.
Changes in the current account balance therefore affect real GDP, employment, and the price level.
When asked to analyse the effect of a current account deficit, state that this means the value of imports is greater than exports (M>X), making (X-M) negative. This is a net withdrawal from the circular flow of income, causing AD to shift left. Always support your explanation with a correctly labelled AD/AS diagram showing a fall in real GDP and the price level.
Structure of the current account
Current account = Trade in goods + Trade in services + Primary income + Secondary income
Balance of trade (goods) = X_goods − M_goods
Net exports = X − M (goods and services) → component of AD
Credits (+): exports, income from abroad, transfers received.
Debits (−): imports, income paid abroad, transfers paid.
Deficit is not always harmful — may reflect strong domestic demand or investment inflows.
Sustainability matters more than sign alone.
Link to aggregate demand
When M > X, net exports are negative — a leakage from AD. Fast domestic growth often widens the deficit as rising incomes boost import spending.
Depreciation of the currency may improve competitiveness: X rise, M fall → (X − M) improves → AD effect depends on Marshall-Lerner condition (A Level).
Worked examples
See the formulas applied — reveal one step at a time, like the exam.
Country R ($ billion):
| - Exports of goods: 80 | Imports of goods: 110 |
|---|---|
| - Exports of services: 45 | Imports of services: 30 |
- Net primary income: −15
- Net secondary income: −5
(a) Calculate the balance of trade in goods. (b) Calculate net exports (goods and services). (c) Calculate the current account balance. (d) If GDP is $500bn, express the current account as a % of GDP.
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(a) Balance of trade in goods = 80 − 110 = −$30 billion (goods trade deficit)
Country R has a current account deficit and unemployment above NAIRU. Policymakers consider depreciation and expansionary fiscal policy.
(a) Show how depreciation affects (X − M) and AD. (b) Show how expansionary fiscal policy affects AD and the current account. (c) Which policy better addresses both unemployment and the deficit?
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(a) Depreciation Currency falls → exports cheaper abroad, imports dearer at home → X↑, M↓ → (X − M) rises → AD increases (if Marshall-Lerner holds) → unemployment may fall.
How it all connects
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Glossary
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Quick check
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Revision flashcards
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Four components of the current account?
Trade in goods, trade in services, primary income (investment income, wages), and secondary income (transfers e.g. remittances, aid).
Key takeaways
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- ✓
Records the flow of money from trade in goods and services, plus income flows.
- ✓
Credits represent inflows of foreign currency, while debits represent outflows.
- ✓
Comprises four components: trade in goods, trade in services, primary income, and secondary income.
- ✓
The final balance is a key indicator of a country's external economic health.
Practice — then mark it
The whole point: a real Cambridge question, marked mark-by-mark.
9708/21 · Q1(c)
Consider the extent to which depreciation of the Sri Lankan rupee could improve the country's balance of trade in goods and services.
9708/22 · Q1(c)
Consider whether continued falls in the value of the South African rand may lead to a reduction in the current account deficit of the balance of payments.
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