Estimated study time: 60 minutes
Content:
International trade theory at CFA Level 2 provides the analytical framework for understanding trade patterns, trade policy effects, and the balance of payments. Comparative advantage — the ability to produce a good at a lower opportunity cost than a trading partner — is the foundation of trade theory. Even if one country has absolute advantage in all goods, both countries can benefit from specialization and trade based on comparative advantage. The Ricardian model demonstrates that countries should export goods in which they have the lowest relative production cost and import goods in which they have the highest. The Heckscher-Ohlin model extends this by arguing that countries export goods that intensively use their abundant factors (labor-abundant countries export labor-intensive goods; capital-abundant countries export capital-intensive goods).
Trade restrictions take several forms: tariffs (taxes on imports), quotas (quantitative limits on imports), export subsidies, and non-tariff barriers (regulatory requirements, standards). The effects of a tariff on a small, price-taking economy are well-defined: domestic price rises by the tariff amount; domestic consumption falls; domestic production rises; imports fall; government collects tariff revenue; consumer surplus falls by more than the sum of tariff revenue and producer surplus gain — the difference is the deadweight loss, representing the efficiency cost of the tariff. A quota has similar effects on price and quantity but distributes the quota rent to import license holders rather than the government. At Level 2, candidates must calculate and compare welfare effects across these trade restriction types.
The balance of payments (BOP) is an accounting framework that records all economic transactions between a country's residents and the rest of the world. It consists of three accounts: the Current Account (CA), the Capital Account (KA, relatively small in most countries), and the Financial Account (FA). The current account includes trade in goods, trade in services, primary income (investment income and compensation), and secondary income (transfer payments). The financial account records purchases and sales of foreign financial assets (FDI, portfolio investment, other investment, and reserve assets). The fundamental BOP identity requires: CA + KA + FA = 0. A current account deficit must be financed by a financial account surplus (net capital inflows). This linkage is critical for exchange rate analysis: persistent current account deficits create demand for foreign currency, putting downward pressure on the domestic currency.
The Mundell-Fleming model extends the IS-LM framework to an open economy, analyzing how fiscal and monetary policy affect output and exchange rates under different exchange rate regimes. Under a floating exchange rate and high capital mobility, monetary policy is highly effective (lower rates attract capital outflows, depreciate the currency, boost exports, and stimulate output) while fiscal policy is largely ineffective (fiscal expansion raises interest rates, attracts capital inflows, appreciates the currency, crowding out net exports). Under a fixed exchange rate, fiscal policy is highly effective (no currency appreciation to crowd out exports) while monetary policy is impotent (the central bank must adjust money supply to maintain the peg). At Level 2, Mundell-Fleming scenarios test whether candidates can determine the qualitative effects of policy changes on exchange rates, interest rates, and output.
Capital flow dynamics and sudden stop risk are important applied concepts. Emerging market economies often run current account deficits financed by foreign portfolio and direct investment. These capital flows are beneficial during normal times (finance higher investment than domestic savings allow) but create vulnerability. A sudden stop occurs when foreign capital inflows abruptly cease or reverse — typically triggered by a loss of investor confidence, global risk-off episodes, or commodity price shocks. The sudden stop forces an abrupt compression of the current account deficit (sharp import reduction), severe currency depreciation, rising domestic interest rates, and often a recession. The BOP-induced crisis mechanism follows: capital outflow → currency pressure → reserve depletion (if pegged) → forced devaluation → balance sheet crises for entities with foreign-currency debt.
Key Terms:
Quiz Questions:
Q1. Country A can produce either 100 units of wheat or 50 units of steel per worker-year. Country B can produce either 80 units of wheat or 60 units of steel per worker-year. Which country has the comparative advantage in steel production, and what does this imply for trade?
A) Country A has comparative advantage in both goods; trade is not beneficial. B) Country B has comparative advantage in steel (opportunity cost = 60/80 = 0.75 wheat per steel vs. Country A's 50/100 = 0.5 wheat per steel); wait, Country A has lower opportunity cost in steel. C) Country A has comparative advantage in steel (opportunity cost of steel = 100/50 = 2 wheat vs. Country B's 80/60 = 1.33 wheat); Country B should specialize in steel and Country A in wheat. D) Country B has comparative advantage in steel (opportunity cost of steel in B = 80/60 = 1.33 wheat vs. Country A's 100/50 = 2 wheat); Country B should export steel and Country A should export wheat.
Answer: D — Opportunity cost of producing one unit of steel: Country A gives up 100/50 = 2 wheat; Country B gives up 80/60 = 1.33 wheat. Country B has the lower opportunity cost for steel production (1.33 < 2), so Country B has comparative advantage in steel. Country A's opportunity cost of wheat = 50/100 = 0.5 steel per wheat, vs. Country B's 60/80 = 0.75 steel per wheat — Country A has comparative advantage in wheat. Trade benefits both: B exports steel, A exports wheat.
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Q2. A small open economy imposes a 20% tariff on imported automobiles. Before the tariff, the world price was $20,000 per vehicle, domestic consumption was 500,000 vehicles, and domestic production was 100,000 vehicles. After the tariff, domestic price rises to $24,000, domestic consumption falls to 450,000, and domestic production rises to 150,000. Government collects tariff revenue on all imports. What is the tariff revenue collected?
A) 50,000 vehicles * $4,000 = $200,000,000. B) 300,000 vehicles * $4,000 = $1,200,000,000. C) 450,000 vehicles * $4,000 = $1,800,000,000. D) 150,000 vehicles * $4,000 = $600,000,000.
Answer: B — After the tariff, imports = domestic consumption - domestic production = 450,000 - 150,000 = 300,000 vehicles. Tariff per vehicle = 20% * $20,000 = $4,000. Tariff revenue = 300,000 * $4,000 = $1,200,000,000. The tariff also generates producer surplus gains (on 50,000 additional domestic production), consumer surplus losses (on all 450,000 consumed), and deadweight loss triangles.
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Q3. The following BOP data is reported for Country Z (in billions USD): Goods trade: -$50B; Services trade: +$20B; Primary income: +$5B; Secondary income: -$3B; Direct investment: +$15B; Portfolio investment: +$25B; Other investment: -$5B. Which of the following statements is correct?
A) Country Z has a current account surplus of $28B. B) Country Z has a current account deficit of $28B financed by a financial account surplus of $35B; the statistical discrepancy accounts for the $7B gap. C) Country Z has a current account deficit of $28B. D) Country Z's BOP is in surplus because the financial account exceeds the current account deficit.
Answer: C — Current account = Goods (-50) + Services (+20) + Primary income (+5) + Secondary income (-3) = -28B. Country Z has a current account deficit of $28B. The financial account = Direct investment (+15) + Portfolio investment (+25) + Other investment (-5) = +35B surplus, which helps finance the CA deficit. The BOP must sum to zero (CA + FA + statistical discrepancy = 0), so there is likely a $7B statistical discrepancy. The BOP itself is always technically balanced by accounting identity; it does not have a "surplus" or "deficit" in aggregate.
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Q4. A small open economy with a floating exchange rate and perfect capital mobility runs an expansionary fiscal policy (increases government spending by 2% of GDP). According to the Mundell-Fleming model, what is the most likely outcome?
A) GDP increases significantly; interest rates and exchange rates are unchanged. B) GDP increases, interest rates rise, capital inflows appreciate the currency, and net exports fall, largely offsetting the fiscal expansion. C) GDP falls because the fiscal expansion crowds out all private investment. D) The exchange rate depreciates because higher government spending increases money demand.
Answer: B — Under the Mundell-Fleming model with floating exchange rates and high capital mobility, fiscal expansion is largely ineffective. The mechanism: government spending raises demand → GDP and interest rates rise → higher rates attract capital inflows → currency appreciates → exports fall and imports rise → net exports (and net export demand) fall, nearly fully crowding out the fiscal stimulus. The result is a change in composition of demand (more government, less net exports) with little net change in GDP.
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Q5. An emerging market country runs a current account deficit of 6% of GDP, financed largely by short-term foreign portfolio investment in domestic bonds. The country has a managed exchange rate peg and foreign exchange reserves equal to 2 months of imports. Which of the following most accurately describes this country's vulnerability?
A) The current account deficit is sustainable because portfolio investment is a reliable long-term financing source. B) The country is highly vulnerable to a sudden stop — if foreign portfolio investors lose confidence and withdraw, reserves are insufficient to defend the peg; the likely outcome is forced devaluation and a financial crisis. C) The managed peg provides full protection against currency crisis as long as reserves exist. D) A current account deficit of 6% of GDP is too small to pose systemic risk.
Answer: B — This scenario combines three major vulnerability factors: (1) a large current account deficit (6% of GDP) requiring continuous external financing, (2) a short-term, mobile financing source (portfolio investment that can leave quickly), and (3) inadequate reserves (2 months of imports; a common minimum threshold is 3-6 months). If investors lose confidence, they withdraw portfolio investments, the currency faces selling pressure, and reserves are quickly depleted. The resulting forced devaluation can trigger balance-sheet crises for entities with unhedged foreign-currency debt.
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