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Balance of Payments, Exchange Rates & Persistent Current Account Imbalances
IB DP Economics — Unit 4: The Global Economy | HL | 4.6 Balance of Payments (HL Extensions)
📋 What You Will Learn
- Explain the structure of the balance of payments and identify the relationship between the current account and the capital/financial account
- Analyse how exchange rate changes affect the current account balance, including the Marshall-Lerner condition and the J-curve effect
- Explain the expenditure-switching and expenditure-reducing approaches to correcting a current account deficit
- Evaluate the causes and consequences of persistent current account deficits and surpluses
- Apply the concepts of exchange rate adjustment, trade elasticities, and macroeconomic policy to real-world current account imbalances
- Assess the effectiveness of policies to correct persistent current account imbalances, including their trade-offs
🔍 Guiding Question Can a country sustain a persistent current account deficit indefinitely, and what are the economic consequences if it cannot?
🌍 Why This Matters The United States has run a current account deficit every year since 1982 — in 2023 it reached $905 billion, roughly 3.3% of GDP. Meanwhile, China and Germany have run persistent surpluses for decades. These imbalances are not just accounting entries: they shape exchange rates, debt levels, employment, and the geopolitical tensions that dominate global trade negotiations today.
1. The Balance of Payments — Structure and Logic
Every international economic transaction a country undertakes is recorded in its balance of payments. Understanding the structure is essential before analysing how exchange rates interact with it.
📖 Definition — Balance of Payments (BOP) The balance of payments is a record of all financial transactions between residents of one country and the rest of the world over a given period. It is divided into the current account, the capital account, and the financial account.
The Three Accounts
- Current Account: records trade in goods (visible trade), trade in services (invisible trade), primary income (investment income, wages), and secondary income (transfers such as foreign aid and remittances)
- Capital Account: records capital transfers (e.g. debt forgiveness, migrant transfers) and acquisition/disposal of non-produced, non-financial assets (e.g. patents, trademarks) — relatively small in most countries
- Financial Account: records flows of financial assets — foreign direct investment (FDI), portfolio investment (shares, bonds), reserve assets, and other investment (loans, deposits)
📖 Definition — Current Account The current account records exports and imports of goods and services, primary income (investment income and compensation of employees), and secondary income (current transfers). A current account deficit means the value of imports of goods, services, and income outflows exceeds the value of exports and income inflows.
The Fundamental BOP Identity
The balance of payments always sums to zero in theory. A current account deficit must be financed by a surplus on the financial account (capital inflows), and vice versa. This is the key accounting identity underpinning all BOP analysis.
💡 The BOP Identity
- Current Account + Capital Account + Financial Account = 0 (plus statistical discrepancy)
- A current account deficit → the country is a net borrower from the rest of the world (financial account surplus)
- A current account surplus → the country is a net lender to the rest of the world (financial account deficit)
- This means a persistent current account deficit implies persistent accumulation of foreign liabilities (debt or foreign ownership of domestic assets)
2. Exchange Rates and the Current Account
Exchange rates are the price of one currency in terms of another. When a currency depreciates, exports become cheaper for foreigners and imports become more expensive domestically — in theory, this should improve the current account. But the reality is more complex.
📖 Definition — Exchange Rate Depreciation A depreciation is a fall in the value of a currency in a floating exchange rate system, caused by market forces (increased supply of the currency or reduced demand for it). A devaluation is a deliberate reduction in the fixed exchange rate by a government or central