ECON305: International Economics Exam Notes

International economics explains how countries trade goods and services, move capital and labor, and set exchange rates under different policy regimes. ECON305 typically asks you to analyze trade patterns, understand gains and losses from globalization, and evaluate how tariffs, quotas, subsidies, exchange-rate movements, and capital flows affect welfare, output, inflation, and balance-of-payments dynamics. These notes are designed to match the style of an exam: clear definitions, rigorous frameworks, worked examples, and South African–context learning strategies grounded in how many universities teach International Economics.

Section 1: Core Frameworks of International Trade and Comparative Advantage

International economics starts with a deceptively simple question: why do countries trade? The answer in most ECON305 syllabi combines classic theory (comparative advantage), modern extensions (scale economies, product differentiation), and policy analysis (tariffs, quotas, and welfare effects). You will also likely be expected to interpret the role of exchange rates and the balance of payments, but without mastering the trade foundations, those topics become memorization rather than analysis.

Subsection 1.1 Comparative Advantage: The Backbone of Trade Theory

Comparative advantage means a country should specialize in producing the good for which it has a lower opportunity cost. Unlike absolute advantage (who can produce something cheaper in absolute terms), comparative advantage can predict mutually beneficial trade even when one country is more productive in everything.

A classic exam approach is to use a 2-good, 2-country model with opportunity costs derived from labor productivity (or unit labor requirements). Even if your lecturer does not require the full Ricardo model, many exam questions implicitly test comparative advantage reasoning.

Opportunity cost method (quick exam skill)

1. Choose a common resource (often labor) as the basis for production possibility.
2. Compute how much of Good X one unit of labor produces in each country.
3. Convert that into opportunity costs:
   • If producing 1 unit of Good X costs ( \text{(opportunity of Good Y)} ), that’s the opportunity cost.

Rule: The country with the lower opportunity cost for a good exports it.

Numerical example (Ricardian intuition)

Suppose South Africa (S) and a partner country (P) can allocate labor to produce:

• South Africa:
  • 1 unit of labor produces 2 radios or 1 ton of maize
• Partner Country:
  • 1 unit of labor produces 1 radio or 1 ton of maize

Opportunity costs:

• South Africa:
  • To produce 1 radio, it gives up ( \frac{1}{2} ) ton maize.
• Partner:
  • To produce 1 radio, it gives up 1 ton maize.

South Africa has the lower opportunity cost in radios ⇒ South Africa exports radios.
By symmetry, Partner exports maize.

Exam relevance for welfare: once comparative advantage is established, trade changes consumption possibilities for both countries. Even without computing exact surplus, you should be able to explain who gains and who loses (using real wage/rental and factor ownership logic, depending on the model used).

Subsection 1.2 Gains from Trade and Welfare Effects

Under many standard assumptions (competitive markets, no distortionary policies), trade leads to gains from specialization. The exam often expects you to distinguish:

• National welfare (overall): usually increases under free trade.
• Distributional effects: within a country, different groups (workers in import-competing sectors vs export sectors, landowners, capital owners) can experience gains or losses.

A common welfare decomposition used in International Economics questions:

• Under free trade:
  • Consumers benefit (lower prices for imports)
  • Producers in export sector benefit (higher prices)
  • Producers in import-competing sector may lose (pressure from cheaper imports)
• Under tariffs/quotas:
  • Government collects revenue
  • Producers may benefit (protected from competition)
  • Consumers pay higher prices
  • Deadweight loss occurs due to inefficiency

Subsection 1.3 Trade Policies: Tariffs, Quotas, and Their Diagram Logic

Many ECON305 exams test policy effects through a “triangle” welfare logic (even if diagrams are not required). You should memorize the standard structure:

Import tariff (small country case with world price fixed)

• Consumers: lose due to higher domestic price.
• Producers: gain due to higher domestic price.
• Government: gains tariff revenue.
• Society:
  • Consumption distortion (overconsumption)
  • Production distortion (inefficient domestic production)
  • Net welfare loss (deadweight loss)

In exams, “which welfare areas appear?” is often more important than naming exact shapes.

Quota

Quotas typically create scarcity rents:

• If quota is allocated by the government to domestic firms, rent accrues to those firms.
• If quota is auctioned, revenue accrues to government.
• Compared with tariffs, quotas can be more distortionary depending on allocation and rent effects.

Key exam contrast:

• Tariff: revenue goes to government.
• Quota: rents go to whoever receives the import licenses (unless auctioned).

Export subsidies

Export subsidies shift supply upward in the exporting country and can increase domestic output, but they:

• cost government budget,
• reduce world efficiency,
• may provoke retaliation.

Subsection 1.4 Specific South African Trade Context: Policy Interpretation

Even though exam questions are often stylized and not country-specific, in South African teaching you may be asked to interpret policy using real structures relevant to South African trade (customs administration, sectoral protection, and exchange-rate influences).

In South Africa, policy discussions frequently involve:

• tariff schedules under trade agreements,
• industrial policy and support for manufacturing,
• the exchange-rate channel affecting import prices (notably fuel and intermediate inputs),
• and the distributional consequences across firms and households.

A strong exam answer connects theory to a plausible South African narrative:

• Tariffs may protect infant industries but can increase input costs for downstream producers.
• Currency depreciation can help exporters but also raises import costs and inflation.

Subsection 1.5 Factor Endowments and the Heckscher–Ohlin Leap

After comparative advantage, the next step is usually Heckscher–Ohlin (H-O) theory: trade patterns depend on countries’ relative factor endowments (capital, labor, land).

Core claim:

• A country exports the goods that use its abundant factor intensively.
• A country imports goods that use its scarce factor.

Exam tasks often require:

• identifying which factor is abundant,
• matching it to labor- or capital-intensive sectors,
• and deriving what happens to wages and returns after trade.

Distribution under H-O

When trade opens:

• abundant-factor owners tend to gain,
• scarce-factor owners tend to lose,
• “factor price equalization” is a strong result under restrictive assumptions (e.g., identical technologies, no transport costs).

Subsection 1.6 Product Differentiation and Scale Economies (Modern Trade Intuition)

If your ECON305 course includes modern trade extensions, you may need to explain:

• increasing returns to scale,
• variety effects (more varieties available from trade),
• and the role of market power.

A frequent exam angle:

• In differentiated goods models, trade can still be mutually beneficial even when comparative advantage is not stark—because consumers value variety and lower unit costs arise from larger markets.

Subsection 1.7 International Trade Terms: Terms of Trade (ToT) and Price Effects

International economics frequently uses terms of trade, defined as:
[
\text{ToT} = \frac{\text{Export Prices}}{\text{Import Prices}}
]
Improvements in ToT mean the country can purchase more imports per unit of exports.

Exam relevance:

• commodity exporters (relevant to South Africa’s export composition) often experience ToT volatility.
• tariffs can affect import prices; currency depreciation affects both export competitiveness and import costs.

Section 2: Balance of Payments, Exchange Rates, and Macroeconomic Linkages

Trade theory alone does not explain the international monetary side of the exam. ECON305 often emphasizes how exchange rates and the balance of payments connect to trade flows, capital flows, inflation, and policy choices. This section focuses on balance-of-payments accounting, exchange-rate regimes, and how depreciation/appreciation transmits into trade and welfare.

Subsection 2.1 Balance of Payments (BoP): Accounting Structure

The balance of payments is a systematic record of economic transactions between residents of a country and the rest of the world. It includes:

• Current account:
  • exports and imports of goods and services,
  • net primary income (e.g., interest, dividends from abroad),
  • net secondary income (transfers, remittances).
• Capital and financial account:
  • financial flows such as foreign direct investment (FDI), portfolio investment, loans.
• Financial account sign conventions depend on the textbook, but conceptually:
  • if foreigners buy domestic assets (inflows), it creates a financing entry.
• Errors and omissions exist due to measurement issues.

Exam skill: interpret narratives with the identity:
[
\text{Current Account} + \text{Capital/Financial Account} + \text{Errors} = 0
]

Current account and net exports

Typically:
[
\text{Current Account} \approx \text{Net Exports of Goods/Services} + \text{Net Income} + \text{Net Transfers}
]
When a country runs a current account deficit, it must be financed by net capital inflows or by reducing foreign reserves (depending on exchange-rate and policy regime).

Subsection 2.2 Exchange Rate Basics: Spot, Nominal vs Real Exchange Rate

Exchange rate definitions that frequently appear in exams:

• Nominal exchange rate (E): price of domestic currency in terms of foreign currency (or vice versa depending on convention).
• Real exchange rate (RER): nominal exchange rate adjusted by relative price levels:
  [
  RER = E \times \frac{P^*}{P}
  ]
  If the domestic price level rises faster than foreign, the real exchange rate can appreciate even if nominal E is constant.

Exam relevance: many macro questions hinge on RER because trade flows respond to relative competitiveness, not just nominal E.

Depreciation vs devaluation

• Depreciation: market-driven fall in currency value.
• Devaluation: policy-driven change (fixed exchange rate regime).

You may be asked to explain why depreciation sometimes fails to improve the trade balance immediately (see J-curve next).

Subsection 2.3 The J-Curve and Elasticities: Why Trade Balances Respond Slowly

The J-curve effect suggests that after depreciation, the trade balance may initially deteriorate before improving.

Mechanisms:

• import prices rise immediately (in domestic currency),
• export volumes respond with a lag due to contracts and production adjustment,
• therefore the trade balance can worsen in the short run.

Then later, as quantities adjust, the trade balance improves.

Elasticities condition

Improvement depends on:

• import demand elasticity (how responsive import quantities are),
• export supply elasticity,
• time horizon.

Exam phrasing: “Depreciation improves the trade balance if the Marshall–Lerner condition holds,” which states:

• the sum of absolute elasticities of exports and imports exceeds 1 (under assumptions).

Subsection 2.4 Marshall–Lerner Condition (What to State and Why)

The Marshall–Lerner condition is a criterion for whether depreciation improves the trade balance. In words:

• if exports become sufficiently more competitive and imports become sufficiently less attractive (in quantity terms), the trade balance improves.

Exam tip: even if you don’t compute numeric elasticities, you must state directionally:

• high elasticity ⇒ larger quantity responses ⇒ stronger effect of depreciation on net exports.

Subsection 2.5 Exchange-Rate Regimes: Fixed vs Floating and Policy Constraints

International Economics exams often compare:

Fixed exchange rate

• Central bank commits to maintain a parity.
• Monetary policy is constrained because the money supply and interest rates must adjust to maintain the exchange rate.
• If external shocks occur, reserves can be depleted.

Crisis narrative often used in exams:

• persistent current account deficit financed by capital inflows,
• later reversal in flows,
• pressure on reserves,
• inability to maintain peg without austerity or devaluation.

Floating exchange rate

• Exchange rate adjusts to shocks.
• Monetary policy has more independence but inflation targeting and credibility become central.

Subsection 2.6 Capital Flows, Interest Rates, and Currency Risk

Capital flows are central in modern international economics. Key components:

• FDI often responds to long-run profitability and institutional stability.
• portfolio flows respond to interest differentials and risk sentiment.
• debt flows can reverse quickly, creating vulnerability.

Interest parity concepts may be included:

• expected changes in exchange rates relate to interest differences under no-arbitrage conditions.

Exam tasks might ask:

• If domestic interest rates rise relative to foreign, what happens to capital flows?
• How can that affect the exchange rate and current account?

Currency risk and sudden stops

A sudden reversal (“sudden stop”) can cause depreciation and a contraction in imports, worsening the current account in the short run but potentially improving it later via quantity effects.

Subsection 2.7 Inflation, Imported Inputs, and Exchange Rate Pass-Through

For a South Africa–relevant macro story, exchange rates affect:

• imported consumer goods,
• imported intermediate inputs (e.g., machinery, chemicals),
• energy imports (often fuel-related).

This can lead to exchange-rate pass-through into domestic inflation. If inflation rises, the real exchange rate may appreciate, weakening export competitiveness and complicating the intended benefit of depreciation.

Exam narrative:

• depreciation raises import prices,
• inflation rises,
• domestic costs rise,
• RER may not depreciate as much as nominal depreciation suggests,
• net exports improvement may be smaller than expected.

Subsection 2.8 Balance of Payments and Policy: Absorption and Demand Shocks

Sometimes ECON305 links BoP outcomes to macro variables:

• domestic demand increases raise imports,
• income growth raises imports,
• fiscal policy may affect exchange rate via interest rates and capital flows.

A classic logic:

1. Higher domestic income increases imports.
2. Current account deteriorates (more imports than exports).
3. Financing requires capital inflows, appreciation pressure, or reserve loss.

In exams, you may be asked to infer whether a policy will improve or worsen external balances depending on how it changes:

• income,
• interest rates,
• and exchange rate.

Section 3: International Financial Integration, Macroeconomic Policy, and Trade-Policy Interactions

International economics is not only about goods trade—financial integration changes how shocks transmit across borders. This section focuses on capital mobility, risk, policy trade-offs, and the interaction between trade policies and macro outcomes. It also equips you with the logic for answering “compare and evaluate” exam questions.

Subsection 3.1 Capital Mobility and the “Trilemma” Intuition (Without Over-Formalism)

A common course theme: countries face constraints among:

• exchange rate stability,
• free capital movement,
• independent monetary policy.

The more capital flows freely and the more the exchange rate is fixed, the less independent monetary policy becomes.

Exam answer structure:

• Identify the regime (fixed/managed vs floating).
• Identify whether capital controls exist or capital is highly mobile.
• State what monetary policy can realistically do.

Even if your lecturer uses a different name, the conceptual trade-off is often tested.

Subsection 3.2 Financial Account Surpluses and Sustainability

A country can run:

• current account deficit financed by net capital inflows,
• or current account surplus financed by net capital outflows.

Sustainability question often arises:

• is the deficit financed by stable flows (FDI) or unstable flows (short-term debt/portfolio)?
• are inflows matched by productivity-enhancing investment or consumption financing?

Exam method:

1. Classify inflows by type (FDI vs portfolio vs debt).
2. Check whether inflows can reverse quickly.
3. Assess currency mismatch risks (if domestic liabilities are foreign-currency denominated).
4. Describe vulnerability channel: depreciation increases debt service costs.

Subsection 3.3 Empirical Thinking: How Economists Connect Theory and Data

Exams occasionally ask for “how would you test” relationships. You might be expected to mention:

• regression frameworks (conceptually),
• using time series and panel data,
• controlling for global conditions (e.g., world interest rates, commodity prices),
• and measuring exchange rates and trade elasticities.

To avoid memorization traps, structure your response:

• specify variables,
• specify expected signs,
• identify plausible confounders.

Example:

• Depreciation → higher import prices → imports fall (if elasticities high).
  Expected sign for trade balance change: positive after adjustment period.

Subsection 3.4 Trade Policy in a Financially Integrated World

Trade policy effects can differ under different financial conditions.

Tariffs in a world of volatile capital flows

A tariff:

• increases domestic prices of imports,
• can reduce import volumes,
• may improve trade balance but can worsen welfare and raise input costs.

However, macro feedback loops:

• higher inflation may prompt monetary tightening (or worsen it),
• exchange rate may move differently depending on interest rate responses,
• capital inflows/outflows react to risk.

So the immediate trade balance effect may not translate into improved external sustainability.

Export subsidies and fiscal cost

Export subsidies increase competitiveness, but:

• they are fiscal burdens,
• can worsen external debt dynamics,
• may trigger retaliation and policy coordination issues.

Subsection 3.5 Case Study Logic: A South African Export-Import Shock Scenario

To make this exam-ready, consider a stylized but realistic scenario common in South African discussions:

• South Africa’s import bill is sensitive to global fuel and intermediate-input prices.
• Suppose the rand depreciates due to global risk-off conditions.
• Import prices rise quickly.
• Inflation rises due to pass-through.
• Higher inflation leads to higher nominal interest rates to maintain credibility.
• Higher interest rates attract some capital inflows, supporting the currency temporarily.

Now connect to trade balance:

• In the short run: imports become more expensive; quantities fall slowly (contracts + consumption smoothing). Trade balance deteriorates (J-curve).
• In the medium run: import volumes adjust; exports may benefit if domestic costs don’t rise too much.
• If inflation pass-through is large, real exchange rate may not depreciate fully, dampening export growth.

Exam response should mention:

• time horizon,
• elasticities, and
• pass-through.

Subsection 3.6 External Shocks and Policy Response: Monetary vs Fiscal vs Exchange Rate

For exam-style “policy evaluation,” prepare a structured response:

1. Identify the shock:
   • terms-of-trade shock (commodity prices),
   • capital flow shock (risk-off/risk-on),
   • demand shock (global recession),
   • supply shock (energy prices).
2. Identify policy instruments available:
   • monetary policy (interest rates),
   • fiscal policy (spending/taxes),
   • exchange rate policy (intervention, managed float),
   • trade policy (tariffs, quotas), if relevant.
3. Assess transmission channels:
   • exchange rate → import prices → inflation,
   • interest rates → capital flows → exchange rate,
   • fiscal spending → domestic demand → imports.
4. Discuss trade-offs:
   • supporting employment vs inflation,
   • preserving reserves vs buffering depreciation.

Subsection 3.7 International Debt and Sovereign Risk

Sovereign risk is often present implicitly in exams about financial integration. Key mechanisms:

• fiscal deficits financed by borrowing increase debt.
• external borrowing raises exposure to exchange rate changes.
• risk premiums increase when global risk rises or domestic fundamentals weaken.
• rising risk premiums raise interest costs, worsening fiscal space.

A strong answer:

• links sovereign risk to external financing conditions,
• explains how depreciation increases debt burdens if liabilities are denominated in foreign currency,
• connects back to current account and reserves.

Subsection 3.8 When Trade Policy and Macro Policy Collide

Tariffs can serve industrial policy goals (protecting manufacturing), but they can conflict with macro stabilization:

• protection raises domestic costs of inputs,
• may fuel inflation,
• may require tighter monetary policy,
• can reduce competitiveness if cost increases outweigh tariff-protected output gains.

In a floating exchange-rate regime:

• tighter monetary policy can appreciate the currency if capital inflows rise,
• appreciation reduces export competitiveness,
• leading to ambiguous effects on net exports.

Therefore, exam answers should highlight interaction effects rather than assuming trade policy works in isolation.

Section 4: Factor Markets, Income Distribution, and Trade Adjustment

International trade affects not only GDP and prices, but also factor markets and the distribution of income. ECON305 exam questions often ask about who gains and who loses, and which adjustment mechanisms exist. For South African contexts, the distributional angle is especially relevant due to inequality, unemployment, and sectoral vulnerability.

Subsection 4.1 Stolper–Samuelson and Rybczynski (Core Results)

If your course covers H-O extended results, you need to know:

Stolper–Samuelson theorem

• In a two-good, two-factor model, an increase in the relative price of a good increases the real return to the factor used intensively in producing that good and decreases the return to the other factor.

Exam implication:

• If a country liberalizes trade and the relative price changes, factor returns shift.
• This explains political economy: sectors tied to gains may support liberalization; sectors tied to losses may oppose it.

Rybczynski theorem

• With fixed factor endowments and given technology, an increase in one factor endowment increases output of the good that uses that factor intensively and decreases output of the other good.

Even if you don’t compute, show clear sign predictions.

Subsection 4.2 Trade Adjustment and Unemployment/Job Displacement Logic

In real economies, workers do not instantly move between sectors. Trade adjustment costs include:

• search costs,
• skills mismatch,
• geographic constraints.

Exam questions may ask:

• why globalization can increase inequality even if total welfare rises,
• why unemployment may persist,
• and what policies can smooth adjustment.

Potential policy tools:

• unemployment insurance,
• retraining programs,
• wage subsidies,
• targeted support for displaced workers,
• active labor market policies.

Subsection 4.3 Distributional Outcomes in South Africa–Relevant Sectors (Conceptual Mapping)

South Africa’s economy includes mining, agriculture, manufacturing, and services. Trade liberalization could affect:

• mining through export demand and commodity prices,
• agriculture through competition with imports,
• manufacturing through input costs and demand for exports,
• services through global demand and regulation.

A strong exam answer should avoid claiming precise sector statistics unless given. Instead, emphasize mechanism:

• import competition reduces output in import-competing sectors,
• export sectors expand where competitiveness exists,
• factor mobility determines speed of adjustment,
• wage and employment outcomes depend on labor market frictions.

Subsection 4.4 Political Economy: Trade Policy Preferences

Trade policy is often shaped by distributional effects. Use a standard political economy framework:

• groups with concentrated gains/losses influence policy decisions.
• consumers are numerous but have diffuse benefits/losses.
• producers can lobby effectively.

Exam answer structure:

1. Identify stakeholders (workers, firms, consumers).
2. Determine expected winners and losers from protection or liberalization.
3. Explain likely policy response based on lobbying incentives and electoral constraints.

Subsection 4.5 Social Welfare vs Efficiency: Why Redistribution Matters

Even when free trade is efficient, the income distribution can become unacceptable. Thus:

• welfare analysis must incorporate distribution and equity.
• redistribution tools can preserve efficiency while improving equity.

Exam-friendly argument:

• If compensating losers is feasible (and politically acceptable), overall welfare can be increased without leaving losers behind.
• Without compensation, the societal gains may still exist, but political and social costs rise.

Subsection 4.6 Learning from Adjustment Failures: Historical Patterns

In many countries, rapid trade liberalization without adjustment support can yield:

• prolonged unemployment,
• informalization,
• regional decline in industries that collapse.

Exam response should connect to adjustment costs and institutional capacity:

• if safety nets are weak, households bear more risk.
• if retraining is ineffective, structural unemployment persists.

Subsection 4.7 Measuring Trade Impact on Inequality (High-Level)

If your exam expects “how would you measure,” mention:

• changes in wages by skill level,
• employment shifts by sector,
• firm-level productivity and survival rates,
• household survey measures of income sources.

Avoid over-precision, but show methodology thinking:

1. define outcome (wage inequality, employment rate),
2. estimate exposure to trade (import penetration, export share),
3. control for confounders (global demand, domestic policy changes),
4. interpret causality carefully (instrumentation or natural experiments if applicable).

Subsection 4.8 Policy Packages for Trade Adjustment: What to Recommend

A high-scoring answer often recommends a bundle rather than a single policy:

• macro stability (reduce inflation and exchange-rate volatility),
• labor market policies (training and mobility support),
• targeted social protection (temporary income support),
• industrial upgrading (support productivity-enhancing investment, not indefinite protection).

For South Africa, where unemployment and inequality are central concerns, such packages align with realistic policy debates:

• support for skills development,
• assistance for SMEs and worker transitions,
• and careful management of import competition impacts on employment.

Section 5: Exam Preparation Toolkit — How to Solve Typical ECON305 International Economics Questions

This section functions as a practical exam toolkit: how to interpret question prompts, what frameworks to apply, and how to write answers that score. It includes worked template examples and checklists. It also integrates South African learning practice: many students perform better when they apply consistent answer structures across different question types.

Subsection 5.1 Mapping Question Types to Frameworks

Common ECON305 question categories include:

1. “Explain why trade occurs”
   • Use comparative advantage and opportunity costs.
2. “Analyze welfare effects of tariffs/quotas”
   • Use consumer/producer/government and deadweight loss logic.
3. “Discuss exchange rate effects on the trade balance”
   • Use J-curve and elasticities.
4. “Evaluate macro policy under balance-of-payments constraints”
   • Use current account financing and monetary constraints.
5. “Who gains and who loses from trade?”
   • Use Stolper–Samuelson, distribution, and adjustment costs.
6. “Assess policy trade-offs in open economies”
   • Use capital flows, risk, pass-through, and trilemma intuition.

A critical exam skill: identify which model is being tested. Don’t start calculating when the question asks for conceptual welfare reasoning.

Subsection 5.2 Answer Structure Template (Use Consistently)

For most written exam questions (especially 10–20 marks), a scoring-friendly structure is:

1. Define the concept (1–2 lines).
2. State the mechanism (2–5 lines).
3. Link to the question’s context (the numbers or scenario given).
4. Draw the conclusion with directionality (who gains/loses; sign of changes).
5. Mention limitations/conditions (elasticity, assumptions, time horizon).

Even if diagrams are not requested, mention “consumers pay higher prices,” “producers gain,” “deadweight loss from inefficiency” to show you know the standard logic.

Subsection 5.3 Worked Practice: Tariff Effects on Welfare (Small Country)

Question (typical style): A small country imposes a tariff on an imported good. Analyze welfare effects and changes in consumer surplus, producer surplus, and government revenue.

Answer blueprint:

• Domestic price rises above world price by the tariff amount.
• Consumers: purchase less and pay higher price ⇒ consumer surplus falls.
• Producers: sell more domestically at higher price ⇒ producer surplus rises.
• Government: earns tariff revenue = tariff rate × import quantity.
• Net welfare:
  • government revenue partially offsets consumer loss,
  • but deadweight losses remain:
    • consumption distortion (triangle A),
    • production distortion (triangle B),
    • net welfare declines relative to free trade.
• Conclusion: tariff reduces national welfare in standard model; distributional effects favor producers and government at consumers’ expense.

If the exam asks for “relative to free trade,” state that explicitly.

Subsection 5.4 Worked Practice: Depreciation and Trade Balance (J-Curve)

Question (typical style): Discuss the impact of a depreciation on the trade balance over the short and medium run.

Answer blueprint:

1. Short run:
   • import prices rise immediately,
   • import quantities adjust slowly,
   • export quantities adjust slowly due to contracts,
   • trade balance may worsen (initial deterioration).
2. Medium run:
   • quantities adjust,
   • exports become cheaper to foreigners,
   • imports become more expensive to domestic consumers,
   • trade balance improves if elasticities are sufficiently large.
3. Conditions/limitations:
   • pass-through into domestic inflation can appreciate the real exchange rate,
   • if import demand is inelastic, improvement may be weaker,
   • if export supply is constrained, export response may lag.

Subsection 5.5 Worked Practice: Comparative Advantage Using Opportunity Costs

Question (typical style): Country A and B produce two goods with different productivity. Use comparative advantage to determine which country exports each good.

Answer blueprint:

1. Compute labor required per unit or output per unit labor.
2. Calculate opportunity costs:
   • opportunity cost of X in terms of Y for each country.
3. Compare:
   • country with lower opportunity cost exports X.
4. Provide the trade direction conclusion.

Then optionally add:

• “Both countries can reach higher consumption bundles than under autarky” if trade allows them to consume beyond production possibility frontiers.

Subsection 5.6 Common Mistakes and How to Avoid Them

Mistake 1: Confusing absolute and comparative advantage.
Fix: always mention opportunity cost.

Mistake 2: Forgetting time horizon.
Fix: always specify short run vs medium run for exchange rate effects.

Mistake 3: Assuming tariff always improves welfare for the importing country.
Fix: include deadweight loss.

Mistake 4: Treating depreciation as automatically improving the trade balance.
Fix: mention elasticities and pass-through.

Mistake 5: Not stating distributional effects.
Fix: include who gains/loses (consumers/producers/government; abundant/scarce factor owners).

Subsection 5.7 South Africa–Centered Study Strategy: How to Learn Efficiently

Because many South African universities, colleges, and TVETs emphasize applied reasoning, you can use a “South Africa lens” without fabricating data:

• Link theory to sectors you have heard about in lectures (mining, agriculture, manufacturing, services).
• Link macro transmission to South Africa–relevant variables:
  • currency movements affecting import prices,
  • fuel and electricity input dependence,
  • commodity price exposure,
  • fiscal capacity constraints.
• Use exam-style narratives:
  • “Assume the rand depreciates due to global risk-off…”
  • “Assume world commodity prices decline…”
  • “Assume a tariff raises import costs for downstream firms…”

This keeps your answers realistic while staying consistent with the hypothetical nature of typical exam questions.

Subsection 5.8 Course-Specific Practice Plan (Generic but Exam-Realistic)

To maximize performance, adopt a weekly cycle:

1. Theory day (40–60 minutes):
   • comparative advantage, H-O predictions, Stolper–Samuelson.
2. Policy day (40–60 minutes):
   • tariffs vs quotas, welfare triangles, political economy.
3. Macro day (40–60 minutes):
   • BoP structure, exchange rate, J-curve, pass-through.
4. Writing day (30–50 minutes):
   • answer 1–2 timed questions, focusing on structure and clarity.
5. Review day (20–30 minutes):
   • create 1-page “formula + mechanisms” sheet.

Consistency matters more than intensity in ECON305 because the subject integrates multiple models.

Subsection 5.9 Rapid Recall Checklist (Last 10 Minutes Before Exam)

Use this mental checklist:

• Trade:
  • comparative advantage → opportunity cost → export pattern.
  • tariff:
    • consumers lose, producers gain, government gains revenue, DWL reduces welfare.
• Exchange rate:
  • depreciation → import price up immediately → possible short-run worsening.
  • medium-run improvement depends on elasticities and pass-through.
• BoP:
  • current account deficit needs financing via capital inflows or reserve change.
• Distribution:
  • factor owners of export good’s intensive factor gain under Stolper–Samuelson.
• Adjustment:
  • unemployment and inequality persist without labor market support.

Institution-Focused Clusters (South African Universities/TVETs): Single-Institution Study Tracks

Below are cluster study tracks, each focusing on one institution’s typical ECON-style learning approach. Each cluster organizes the same International Economics content into a course-driven revision pattern: what to emphasize, how to write answers, and what diagrams/mechanisms to practice. Titles below are formatted like “Institution + Course code / style + Exam Notes” to mirror South African exam preparation conventions.

Cluster A: University of Johannesburg — ECON305 International Economics Exam Notes

University of Johannesburg (UJ) students often benefit from an approach that integrates conceptual theory with policy interpretation—especially where questions are phrased in scenario form (“discuss,” “evaluate,” “analyze”). The emphasis in many UJ economics modules tends to reward students for structured explanations rather than only definitions.

Subsection A1 What UJ-Style ECON305 Exams Commonly Test

Based on frequent patterns across South African university economics assessments, you should expect emphasis on:

• Trade theory (comparative advantage; H-O intuition).
• Policy analysis (tariffs vs quotas; export subsidies).
• External sector (BoP; exchange rate effects).
• Distribution (who gains and loses; adjustment).

Even when diagrams are not explicitly required, UJ assessments often reward students for mentioning:

• consumers, producers, government,
• deadweight loss channels,
• and time horizon logic for exchange-rate questions.

Subsection A2 Writing a “Discuss Tariffs and Welfare” Answer the UJ Way

A high-scoring UJ-style answer usually has:

1. Definition of tariff and domestic price effect.
2. Mechanism: raise domestic price above world price.
3. Welfare decomposition:
   • consumer surplus decreases,
   • producer surplus increases,
   • government revenue arises.
4. Inefficiency:
   • consumption distortion,
   • production distortion.
5. Conclusion:
   • national welfare decreases in the small-country model,
   • distribution changes in favor of protected producers.

Then add a short evaluation:

• tariffs may support infant industry or protect jobs,
• but at cost of higher prices and possible input-cost effects.

This last part is critical: UJ exams frequently reward balanced evaluation rather than a purely textbook “tariff always reduces welfare” statement.

Subsection A3 Exchange Rate Questions: Make Them Policy-Interpretive

For exchange-rate exam questions, students sometimes stop at J-curve. A UJ-friendly answer adds:

• real exchange rate and pass-through into inflation,
• policy constraints (central bank credibility, inflation-targeting pressures),
• competitiveness channel (exports become cheaper),
• and distribution:
  • households dependent on imported consumption may lose during depreciation,
  • exporters may gain if they are not fully exposed to imported inputs.

Subsection A4 Mini Case Practice (Scenario Form)

Create practice for scenario phrases like:

• “A depreciation increases import prices…”
• “Capital inflows reverse due to global interest rates rising…”
• “Commodity prices fall, worsening the current account…”

Your job in the answer:

1. Identify the immediate channel (prices/import bill; financing needs).
2. Identify the adjustment channel (quantities; elasticities; reserves).
3. Identify the macro policy response likely (interest rates; exchange rate management).
4. Provide a plausible time path (short-run vs medium-run).

Subsection A5 UJ Revision Sprint (One-Week Plan)

If you are revising close to exam time:

• Day 1: comparative advantage + opportunity cost practice (2 questions).
• Day 2: tariff vs quota welfare decomposition (2 questions).
• Day 3: BoP identity + current account narrative (1–2 questions).
• Day 4: depreciation + J-curve + pass-through (2 questions).
• Day 5: Stolper–Samuelson + adjustment costs + policy packages (2 questions).
• Day 6: timed mixed set (2 short essays).
• Day 7: error-correction review.

Cluster B: University of Pretoria — ECON305 International Economics Exam Notes

University of Pretoria (UP) students often encounter examinations that are academically rigorous in model assumptions and demand clarity about what drives the results. UP-style answers tend to score higher when you state assumptions (e.g., small country; competitive markets; fixed world price) and then discuss conditions.

Subsection B1 UP Exam Focus: Assumptions and Conditions

Your best exam performance at UP often comes from:

• explicitly stating “small country” when analyzing tariff welfare with a fixed world price,
• stating “competitive markets” for welfare triangles,
• stating whether the model presumes immobile factors in the short run and mobile factors in the long run.

Even one sentence can separate a full-credit answer from a partial-credit one.

Subsection B2 Tariffs: “Welfare Loss” Must Include Deadweight Logic

UP questions sometimes ask you to “derive” qualitatively why welfare falls. Your answer should include both distortion types:

• Consumption distortion: higher domestic price reduces consumption below efficient level.
• Production distortion: domestic production increases in inefficient ways.

Also include the government revenue offset:

• revenue is a transfer from consumers to government; it reduces net welfare loss but does not eliminate it because of deadweight losses.

Subsection B3 Exchange Rate and Pass-Through: Real Exchange Rate Link

UP exams may stress the distinction between:

• nominal depreciation and
• real depreciation.

Therefore, include:

• exchange rate → imported inflation → domestic price rise → real appreciation risk.

You should write:

• “If pass-through is high, the real exchange rate may not depreciate as much, weakening the trade balance improvement.”

This makes your answer more “UP” and less “generic.”

Subsection B4 Factor Distribution: Include Stolper–Samuelson Logic

When asked who gains, avoid vague answers. Write in theorem-logic form:

• If relative price of exportable rises,
• then return to factor used intensively in exportable increases,
• return to other factor decreases.

Then connect to South Africa:

• labor-intensive sectors vs capital-intensive sectors,
• unemployment and wage bargaining effects.

Subsection B5 UP-Style Timed Essay Template

A strong UP essay typically uses this structure:

1. Model statement/assumptions (2–4 lines).
2. Mechanism (4–6 lines).
3. Predictions (directional effects with short reasoning).
4. Policy evaluation (conditions; limitations).
5. Conclusion (1–2 lines).

Subsection B6 Practice: A Comparison Essay Prompt

A common UP-style prompt might be:

“Compare the effects of tariffs and quotas on welfare. Evaluate the implications for policy.”

A full answer includes:

• price impact,
• government revenue vs quota rents,
• deadweight losses,
• and the political economy difference (rent-seeking under quotas).

Cluster C: Stellenbosch University — ECON305 International Economics Exam Notes

Stellenbosch University (SU) economics education often values analytical clarity and the ability to reason through economic logic. SU students may be required to articulate mechanisms and provide structured comparisons, especially for policy and external-sector questions.

Subsection C1 SU Focus: Structured Economic Arguments

To match SU assessment style:

• Write “cause → effect” chains.
• Use consistent sign/direction language:
  • “increase/decrease in price,” “increase/decrease in quantity,” “improvement/deterioration in trade balance.”

Subsection C2 SU Policy Analysis: Beyond Welfare Triangles

SU exams can include evaluation:

• “When could tariffs be justified?”
• “Discuss conditions under which protection might be beneficial.”

Your answer:

• should not only say “infant industry,” but explain why protection could temporarily raise productivity or learning-by-doing.
• then highlight pitfalls:
  • rent-seeking,
  • permanent protection,
  • lack of competitiveness gains,
  • high input costs for downstream industries.

This is a key difference between “exam pass” and “high distinction.”

Subsection C3 External Sector: BoP and Sustainability Framing

SU may ask for sustainability:

• “A current account deficit financed by foreign borrowing—discuss risks.”

Your answer should:

• separate financing types (FDI vs debt vs portfolio),
• discuss exchange rate and liquidity risks,
• mention reserve adequacy and global interest-rate conditions.

Subsection C4 SU Trade and Distribution: Apply Theorems with Interpretation

SU students should interpret theorem outcomes with real-world meaning:

• If labor is relatively abundant, export sectors likely labor-intensive.
• Trade liberalization changes relative prices → changes relative factor returns.
• Then discuss adjustment costs and policy responses.

Subsection C5 SU Exam Practice: Mixed Model Questions

Prepare short answers that combine:

• trade policy and exchange rate
• or exchange rate and BoP identity.

Example prompt practice:

• “If a tariff raises domestic demand for locally produced substitutes, how might it affect imports and the current account?”

Answer approach:

1. Tariff raises relative price → changes import quantities.
2. Import reduction may improve current account,
3. but inflation effects and exchange rate adjustments can offset.

Cluster D: Cape Peninsula University of Technology (CPUT) — ECON305 International Economics Exam Notes

CPUT’s applied learning orientation means students often do better when they connect theory to observable economic mechanisms and communicate clearly under time pressure. Even when not explicitly asked, examples and scenario narratives can boost comprehension and marks.

Subsection D1 CPUT Exam Focus: Clarity and Mechanism-Based Explanations

CPUT answers should be:

• direct,
• mechanism-driven,
• and using simple but correct economic language.

Aim to:

• define terms,
• show how variables move,
• explain outcomes without excessive technical jargon.

Subsection D2 CPUT Welfare Questions: Keep Diagrams Logical

Even if diagrams are not drawn, mention:

• consumers vs producers,
• government revenue,
• deadweight losses.

Use “areas” language as shorthand:

• “loss to consumers is larger than revenue,”
• “deadweight loss arises from inefficiency.”

Subsection D3 CPUT Exchange Rate Questions: Translate to Households and Firms

To fit CPUT applied emphasis:

• depreciation affects import prices,
• which affects household budgets,
• and production costs for firms using imported inputs.

Then connect back to:

• export demand changes,
• and macro policy response.

Subsection D4 CPUT Practice Scenarios

Use consistent scenario templates:

• “Suppose rand depreciates and fuel imports rise…”
• “Suppose global recession reduces export demand…”
• “Suppose capital inflows slow due to rising world interest rates…”

In each:

1. identify the channel,
2. state the direction of effects on inflation/output/external balance,
3. explain who bears the cost and who benefits.

Cluster E: TVET (Durban University of Technology-style Applied Economics Track) — ECON305 International Economics Exam Notes

TVET economics tracks often emphasize practical understanding and clear, exam-ready writing. While the technical depth may vary, the International Economics core logic remains: trade, external accounts, and exchange rates.

Subsection E1 TVET Exam Focus: Fundamental Concepts with Correct Directionality

Your writing should include:

• what the concept means,
• why it matters,
• and what happens when the key variable changes (tariff up, exchange rate depreciates, capital flows reverse).

Avoid overly complex formalism unless your course demands it.

Subsection E2 TVET Welfare and Trade Policy: Use Consumer/Producer/Government Language

For tariffs:

• Consumers: pay higher price.
• Producers: sell more domestically.
• Government: collects revenue.
• Net result: inefficiency reduces total welfare.

For quotas:

• Scarcity leads to rents.
• Who gets rents depends on allocation method.

Subsection E3 TVET Exchange Rate: Focus on J-Curve Storytelling

A good TVET answer:

• short run: import prices rise fast, trade balance may worsen,
• later: quantities adjust, exports become more competitive, trade balance improves if elasticities allow.

Subsection E4 TVET Study Technique: Short Bullet Answers for Speed

Because TVET exams sometimes reward speed and clarity:

• memorize 1–2 sentence mechanisms for each major concept,
• then use longer paragraphs only when asked to evaluate or discuss.

Subsection E5 Final Revision Checklist for TVET Learners

Before the exam:

• practice 5 “definition-to-mechanism” answers,
• practice 5 “policy effect” answers (tariff, quota, export subsidy),
• practice 5 “exchange rate trade balance” narratives (J-curve and pass-through),
• practice 3 “who gains/who loses” factor stories.

Concluding Exam Readiness: The Complete ECON305 “Mind Map” in Words

To close with coherence (while still functioning as exam notes), here is the integrated mental map you should carry:

1. Trade starts with comparative advantage (opportunity cost) and can extend through H-O (factor endowments).
2. Trade policies (tariffs, quotas, subsidies) change domestic prices and quantities:
   • winners and losers differ by sector,
   • and total welfare changes due to deadweight loss.
3. The balance of payments records the external flows:
   • current account deficits require financing (capital inflows or reserve changes).
4. Exchange rates link the real and nominal economy:
   • depreciation can improve competitiveness, but short-run effects follow the J-curve,
   • and inflation pass-through can offset gains by affecting the real exchange rate.
5. Financial integration and risk determine how easily the country can finance deficits:
   • unstable capital flows can reverse, causing macro stress.
6. Distribution and adjustment determine political support:
   • Stolper–Samuelson explains factor winners/losers,
   • adjustment costs explain unemployment persistence and inequality risks.
7. A strong exam answer is structured:
   • define → mechanism → conditions → direction of effects → evaluation/limitations.

If you can reproduce these chains under time pressure, you are prepared for the typical ECON305 International Economics exam question set—and you will be able to adapt your reasoning to South African context scenarios without losing theoretical correctness.