ECON3009: International Economics Study Guide

International economics explores how countries interact through trade in goods and services, cross-border investment, capital flows, exchange rates, and policy choices. ECON3009 typically builds the analytical toolkit to explain real-world outcomes—such as why some countries run persistent current-account deficits, how currency movements affect trade, and how trade restrictions shift welfare across groups. This study guide focuses on what you need to master for exams, with clear models, worked reasoning, and South African university–aligned examples.

Section 1: Core Frameworks, Measurement, and Trade Patterns in the Open Economy

International economics is often tested through a combination of (1) theory—models and diagrams, (2) measurement—how economists quantify trade and capital flows, and (3) interpretation—linking policy or shocks to outcomes. A strong exam performance in ECON3009 requires both speed and correctness: you must know what each indicator means, what sign to expect when something changes, and how to justify conclusions using the model rather than intuition.

1.1 The “Small Open Economy” vs “Large Open Economy” Lens

A frequent exam trap is mixing up “small” and “large” country assumptions.

• Small open economy: The country is a price taker in world markets.
  • World price of exports/imports is given.
  • Terms of trade (the ratio of export prices to import prices) is not affected by domestic policy or demand.
• Large open economy: The country can influence world prices.
  • Changes in domestic demand or policy can shift world prices.
  • Terms of trade matters for welfare.

How to spot which applies: Many exam questions specify the country is “small” or ask you to treat world prices as “given.” When unspecified, the question may want you to discuss both cases.

Example in a South African context: When analyzing the effect of changing tariff rates on South African imports of a globally traded commodity, you may be expected to treat South Africa as relatively small in world markets for many industrial goods—particularly if the question is about standard consumer imports or manufactured inputs. But for country-sized commodity influences (e.g., some commodity-specific discussions), you may be prompted to consider large-country effects—though in most standard ECON3009 courses, the “small economy” assumption is dominant.

1.2 The Balance of Payments Identity and Its Econ Meaning

The Balance of Payments (BoP) is the backbone of many open-economy questions. You should be able to interpret sign conventions and explain linkages between sections of the BoP.

A useful and commonly tested identity is:

[
\text{Current Account (CA)} + \text{Capital/Financial Account (KA/FA)} + \text{Errors & Omissions} = 0
]

In simplified presentations (and sometimes in course notes), errors & omissions are ignored, and you see:

[
CA + FA = 0
]

Meaning:

• If CA is negative (deficit), then net capital inflows must occur (or reserves must fall).
• If CA is positive (surplus), then net capital outflows must occur (or reserves must rise).

Why it matters for exams: Questions often describe real-world observations—e.g., “a current-account deficit financed by foreign portfolio investment”—and ask which BoP components must be positive/negative. You must translate narrative into signs.

1.3 The Current Account: Components and Interpretation

The current account typically includes:

• Trade in goods (exports minus imports)
• Trade in services
• Net primary income (e.g., interest, dividends, wages)
• Net secondary income (transfers)

A clean simplification you can use in exam reasoning:

[
CA \approx (X – M) + \text{Net income} + \text{Net transfers}
]

Key interpretation skill:

• An increase in imports relative to exports tends to reduce CA (more negative).
• Higher net interest/dividend payments abroad reduce CA.
• Remittances are often included in secondary income; the effect depends on sign and whether they are incoming or outgoing.

1.4 Exchange Rates: Nominal vs Real Exchange Rate

Exchange rates connect trade flows and macro outcomes. Exams frequently test your ability to reason using the real exchange rate (RER) rather than just the nominal rate.

A common definition:

[
\text{RER} = e \times \frac{P^*}{P}
]

Where:

• (e) is the nominal exchange rate (domestic currency per unit of foreign currency, depending on convention)
• (P^*) is foreign price level
• (P) is domestic price level

Intuition:

• If RER rises (domestic goods relatively more expensive), exports become harder to sell and imports become cheaper → CA tends to worsen.
• If RER falls, exports become cheaper and imports relatively more expensive → CA tends to improve.

South African example framing: Consider a depreciation of the rand. If domestic inflation does not fully offset the depreciation, the RER may fall (depending on convention), supporting a switch toward domestically produced goods and reducing import demand—though the final magnitude depends on import demand elasticities and pass-through to prices.

1.5 Trade Elasticities and the Marshall–Lerner Condition

Trade policy questions often hinge on whether a currency depreciation improves the trade balance. The Marshall–Lerner condition states that:

• A depreciation improves the trade balance if the sum of export and import demand elasticities exceeds 1.

In exam logic:

• If demand is price inelastic, depreciation mainly raises the local-currency cost of imports without reducing quantities enough → CA improvement may be small or negative.
• If demand is price elastic, depreciation shifts consumption and production toward domestic goods → trade balance improves.

How this becomes testable: You may be given qualitative statements like “imports are essential inputs with low elasticity” (then elasticity is small) or “consumers can switch to substitutes” (higher elasticity). You must connect elasticity to CA effect direction.

1.6 Comparative Advantage, Absolute Advantage, and Opportunity Cost

Even if ECON3009 emphasizes applied macro links, the trade basics remain fundamental.

• Absolute advantage: ability to produce more with fewer resources.
• Comparative advantage: ability to produce at lower opportunity cost.

For exam diagrams or reasoning:

• Comparative advantage implies mutual gains from trade, even when one country is better at producing everything (absolute advantage).
• You should be able to explain how specialization changes production possibilities.

Worked reasoning template:

1. Identify opportunity costs (relative prices).
2. Determine which country has lower opportunity cost for each good.
3. Conclude which good each country should specialize in.
4. Link trade to consumption gains relative to autarky.

1.7 Factor Endowments and Heckscher–Ohlin (H–O) Intuition

A second major trade theory is the Heckscher–Ohlin model, based on factor abundance:

• Labor-abundant country exports labor-intensive goods.
• Capital-abundant country exports capital-intensive goods.

Exam angle: The H–O model also links trade to factor prices:

• Exporting a labor-intensive good tends to raise the return to labor in the labor-abundant country.
• Import-competing sectors face pressure.

This becomes relevant for welfare and distributional effects:

• National welfare may rise, but specific groups can lose.

1.8 Gravity Model and Trade Flows: Applied Patterns

Modern trade empirical patterns are often approximated using the gravity model: trade is higher between countries that are:

• larger in economic size,
• closer geographically,
• have lower trade barriers (or stronger institutional ties),
• share common language/culture (as empirical proxies).

What to do in exams:
If the question references distance, common border, or regional integration (e.g., within African regional trade agreements), you can interpret expected trade effects qualitatively consistent with gravity-style reasoning.

Section 2: Trade Policy, Welfare, and Distributional Effects (Including South African Case Reasoning)

Trade policy is one of the most exam-favored areas in international economics because it combines models (tariffs, quotas), diagram logic (deadweight loss), and real policy interpretation (welfare, government revenue, adjustment costs). The challenge is to separate efficiency, equity, and political economy in your explanations.

2.1 Tariffs: Consumer, Producer, Government, and Deadweight Loss Effects

Consider a tariff on imports in a small open economy. The standard welfare decomposition is:

1. Consumers lose due to higher domestic prices and reduced quantity.
2. Producers gain due to higher domestic prices (production shifts).
3. Government gains tariff revenue (tariff rate × imports after tariff).
4. Society experiences:
   • Production inefficiency (resources shift to higher-cost domestic production),
   • Consumption inefficiency (consumers buy less, but it comes at the cost of reducing welfare).
   • Together these create deadweight loss.

Exam statement you should master:

• Tariffs reduce total welfare in a small open economy (absent externalities or market power), because gains to producers and government are outweighed by deadweight loss.

2.2 Quotas vs Tariffs: WTO-Relevant Distinctions

A quota sets a quantity limit on imports. It creates a wedge similar to a tariff, but the welfare decomposition differs because quota rents must be allocated.

Two common quota scenarios:

• Quota administered by government (rent accrues to domestic agent or government)
  • Quota rents may produce a transfer to either domestic interests or the government.
• Quota licenses captured by foreign exporters (or auctioned)
  • Rent distribution changes.

Core testable idea:

• A quota also produces deadweight loss similar to tariffs.
• But the transfer component differs; welfare outcomes can look similar in efficiency terms, while distribution changes.

2.3 Tariffs, Multiple Imports, and Input–Output Linkages

In real economies, tariffs affect not just final consumers but also intermediate inputs used by firms. This creates exam-ready analysis of trade policy “incidence.”

For example:

• A tariff on imported steel increases input costs for domestic manufacturing.
• That can reduce production in downstream industries.
• Even if domestic steel producers benefit, downstream firms may contract, potentially offsetting gains.

How to argue in an essay:

• Start with direct tariff effects.
• Then add indirect effects via supply chains.
• Conclude whether net welfare may be less favorable than simplistic single-market models suggest.

2.4 Comparative Advantage Undermining and the “Infant Industry” Argument

A classic debate is whether tariffs can support “infant” industries. The infant industry argument claims temporary protection can allow learning and economies of scale. The counter-argument is that protection may become permanent, benefiting inefficient firms and generating political capture.

In exam answers:

• Provide conditions under which infant industry protection might be welfare-improving:
  • learning externalities exist,
  • the infant industry can eventually become competitive,
  • protection is temporary and credible,
  • there is a mechanism to avoid rent-seeking.
• Then provide the main risks:
  • lack of sunset clauses,
  • bureaucratic or political capture,
  • high opportunity cost of capital.

2.5 Trade Liberalisation and Adjustment Costs

Trade liberalisation typically increases aggregate efficiency but creates losers in protected sectors. In a distributional exam question, you should mention:

• unemployment risk in import-competing sectors,
• need for retraining,
• wage adjustments,
• sectoral reallocation.

A clean structure for answers:

1. Aggregate welfare effect: typically positive under standard assumptions.
2. Distribution: some groups lose.
3. Policy response: social safety nets, active labor-market policies, credible adjustment support.

2.6 Political Economy: Why Protection Persists

A strong international economics course often integrates political economy. You can explain protection as:

• concentrated benefits to producers,
• diffuse costs to consumers.

Classic logic:

• Import-competing firms gain clearly from protection.
• Consumers experience small increases in prices across many goods.
• Organized groups lobby; dispersed groups struggle to coordinate.

Examination-ready phrasing:

• “Protection may be sustained even when it reduces national welfare due to the asymmetry of political incentives.”

2.7 South African Policy-Relevant Reasoning (without needing a single “official” tariff number)

South African trade policy questions may reference:

• tariff changes,
• trade facilitation,
• regional integration within Southern Africa,
• import competition and domestic reallocation.

For exam reasoning, you can use stylized facts consistently:

• South Africa’s economy contains both highly competitive sectors and sectors needing modernization.
• Import competition can pressure firms dependent on protection.
• Trade liberalisation impacts jobs unevenly across regions and skills.

When the question asks “what is likely to happen,” it expects directionally correct answers:

• reduced tariff barriers → lower domestic prices for protected goods and potentially higher import volumes,
• possible industry contraction in protected sectors,
• improved efficiency and competitiveness over time.

2.8 Numerical Welfare Example Template (Tariff)

If a question gives numbers, use the standard approach:

1. Determine world price (P_w) and domestic price with tariff (P_t = P_w + t).
2. Compute quantities:
   • domestic supply (Q_s(P_t)),
   • domestic demand (Q_d(P_t)),
   • imports (M(P_t) = Q_d – Q_s).
3. Welfare decomposition:
   • Producer surplus change: triangle under domestic supply and above world price.
   • Consumer surplus change: triangle under world price and above demand curve (reversed sign).
   • Government revenue: rectangle (tariff × imports).
   • Deadweight losses: two triangles (production inefficiency and consumption inefficiency).

Exam caution: Many mistakes come from mixing up which triangles correspond to which loss. A dependable method is to draw:

• domestic supply and demand,
• world price as the baseline,
• tariff wedge,
• then shade welfare rectangles and triangles systematically.

Section 3: Exchange Rates, Balance of Payments Crises, and Macroeconomic Policy in Open Economies

ECON3009 often assesses how exchange rates and macro policies interact with external balances. This section builds the reasoning chains you need: shocks → exchange rates → trade balances → capital flows → macro adjustment.

3.1 Exchange Rate Regimes: Fixed vs Floating (and Intermediate Arrangements)

A first-order exam distinction:

• Fixed exchange rate: Central bank commits to maintaining a peg.
  • Requires reserves and potentially capital controls.
  • When fundamentals deteriorate, speculative pressure increases.
• Floating exchange rate: Exchange rate adjusts to clear external balance.
  • Absorbs shocks, but introduces volatility and pass-through risk.

Intermediate/real-world points: Many countries operate managed floats or bands. In exam questions, you can answer using fixed vs floating as the conceptual extremes, then discuss how “managed” versions compromise.

3.2 Mundell–Fleming Model: Fiscal and Monetary Policy Under Capital Mobility

The Mundell–Fleming framework connects:

• interest rates,
• capital flows,
• output,
• exchange rate regime.

You should know the qualitative policy predictions under high capital mobility:

Under a Floating Exchange Rate

• Monetary expansion → lower interest rate → currency depreciation → higher net exports → higher output.
• Fiscal expansion → higher interest rate → currency appreciation → lower net exports → output effect can be smaller or even offset, depending on parameter assumptions.

Under a Fixed Exchange Rate

• Monetary expansion is constrained:
  • central bank must maintain the peg by adjusting money supply/reserves.
• Fiscal expansion:
  • raises interest rates → capital inflow → upward pressure on currency
  • under fixed rates, central bank buys foreign currency → increases money supply → output rises more strongly than under floating.

How to score high: Many exam answers become partial. The key is to explicitly mention:

• interest parity link,
• direction of currency movement,
• sign of net exports,
• and resulting output change.

3.3 The Real Exchange Rate and External Adjustment

External adjustment can be driven by:

• price effects (real depreciation reduces imports and raises exports),
• income effects (recession reduces imports, improving CA),
• capital-flow responses (interest rate changes and risk perceptions).

Important nuance: A depreciation does not guarantee CA improvement if:

• import demand is price-inelastic,
• export supply responds slowly,
• prices respond quickly via depreciation pass-through,
• a currency mismatch exists (banks/firms with foreign-currency liabilities).

3.4 Currency Depreciation and the J-Curve

A frequently tested empirical pattern is the J-curve:

• Right after depreciation, the trade balance may worsen because contracts and quantities adjust slowly.
• Over time, quantities adjust and trade balance improves.

A typical exam description:

• Short run: higher import costs, quantities fixed → CA/ trade balance falls.
• Medium run: consumption and production adjust → CA improves.

How to answer a question about timing:
If asked “why not immediate improvement,” cite that trade volumes and invoicing/contracting adjust with a lag.

3.5 Balance of Payments Crises: Sudden Stops and Reserve Loss

A crisis often occurs when investors lose confidence and stop funding deficits:

• current-account deficit financed by short-term capital becomes vulnerable,
• foreign-currency debt increases solvency risks when currency depreciates,
• reserves decline under defense of a peg.

Mechanisms that appear in exam prompts:

• deterioration in macro fundamentals,
• political uncertainty increasing risk premium,
• overvaluation of exchange rate,
• banking sector exposure to foreign currency.

3.6 Capital Mobility, Risk Premium, and Exchange Rate Outcomes

Even if interest parity holds in theory, in real markets investors demand a risk premium:

• riskier assets offer higher expected returns,
• country risk spreads widen when fundamentals worsen.

In exam reasoning:

• higher risk premium → higher required domestic interest rate to attract capital,
• can cause currency appreciation under floating (capital inflow for return) or depreciation if investors exit,
• under fixed regimes, it can create reserve losses and eventual devaluation.

3.7 Pass-Through to Domestic Prices and Inflation

Depreciation affects the domestic price level through imported inflation:

• imported intermediate goods raise production costs,
• consumer goods prices rise,
• inflation increases, affecting real wages and policy responses.

Policy interaction:

• If central bank tightens to reduce inflation, output may contract.
• If it expands to support output, inflation and external balances may worsen.

3.8 South Africa–Linked Analytical Scenarios (Consistent, Directional)

Exams often use South Africa as a case for applied reasoning. Without needing exact numeric data, you can build consistent scenarios:

Scenario A: Rand Depreciation and Current Account

• Suppose the rand depreciates due to global risk-off and domestic risk premium increases.
• Short run: imports become more expensive → import bill rises or import quantities don’t fall enough immediately.
• Output could fall if inflation rises and financial conditions tighten.
• Over time: some substitution toward domestic goods and reduced import demand improves CA if elasticities are adequate.

Scenario B: Fixed vs Managed Regime Implications

• If the exchange rate were managed tightly, defense would require reserve support.
• With short-term capital flows, defense can become unstable and lead to abrupt adjustment.

What graders look for: The consistent sign logic connecting depreciation → inflation/pass-through → net exports and output → CA.

Section 4: International Trade Theory Extensions—Gains from Trade, Terms of Trade, and Offshoring/Fragmentation

Beyond tariffs and exchange rates, ECON3009 frequently evaluates more advanced conceptual expansions: terms of trade effects, market power, intra-industry trade, and how global value chains change the meaning of “trade.”

4.1 Gains from Trade: Living Standards and Real Income

A classic exam answer should distinguish:

• static gains: reallocation of resources based on comparative advantage,
• dynamic gains: productivity improvement via competition, technology transfer, and scale economies.

Static gains show as improved consumption bundles relative to autarky.

Dynamic gains require additional assumptions:

• learning-by-doing,
• innovation incentives,
• better allocation enabling productivity growth.

4.2 Terms of Trade and Large-Country Welfare

In a large-country context, a country’s trade policy can affect world prices.

• A tariff can shift the terms of trade (for the large exporter/importer, depending on structure).
• Sometimes this creates a “beggar-thy-neighbor” or “optimal tariff” outcome under market power assumptions.

But exam marking expects caution:

• the gain to improve terms of trade may be offset by consumption distortion and retaliation by trading partners.

4.3 Optimal Tariff and Retaliation (Strategic Trade)

For strategic trade questions, you must:

• specify the assumptions: large country, market power, retaliatory behavior.
• argue both the direction and the limits:
  • in absence of retaliation and with significant market power, an “optimal tariff” might exist,
  • with retaliation or weak market power, the policy may fail.

4.4 Intra-Industry Trade and Product Differentiation

When countries trade similar goods (e.g., both export and import automobiles within the same broad category), classical comparative advantage (by industry) is not sufficient.

Intra-industry trade is explained by:

• product differentiation,
• economies of scale and variety,
• consumer preference for variety.

In exams:

• You might be asked to interpret trade indices or qualitative statements like “both countries have advanced manufacturing and exchange similar categories.”

4.5 The Trade Balance vs the Current Account: Subtle Differences

Students often confuse these. A careful answer:

• Trade balance = exports of goods − imports of goods (sometimes excluding services).
• Current account includes services, income, and transfers.

Thus, a country may have a trade surplus but a current account deficit (e.g., large net income outflows such as interest on external debt).

4.6 Offshoring, Fragmentation, and the Meaning of Import Content

Global value chains mean that imports may embody domestic value:

• a country imports intermediate inputs,
• uses them to produce exports.

Why this matters in exams:

• Tariffs on intermediates can raise costs of exporting firms.
• Policies aimed at reducing “imports” may hurt domestic exporters too.

A consistent explanation structure:

1. Define value-chain logic.
2. Identify how tariffs affect intermediate inputs.
3. Explain how that changes production and export competitiveness.
4. Conclude welfare and distribution effects across sectors.

4.7 Trade Policy and Productivity: Competition vs Adjustment Costs

Liberalisation can increase productivity through competition, but it can also cause:

• “creative destruction,”
• increased unemployment in the short run,
• firm exits and capacity underutilization.

In an essay:

• provide both arguments,
• show when productivity gains are likely: supportive institutions, labor mobility, credit access for surviving firms.

4.8 Case-Based Reasoning: Regional Integration and Trade Creation

Regional integration is often tested with trade creation vs trade diversion.

• Trade creation: members switch from higher-cost non-members to lower-cost members.
• Trade diversion: members switch from lower-cost non-members to higher-cost members because intra-bloc preferences exist.

How to answer with limited data:

• Use a qualitative decision rule:
  • If the integrated partner is generally lower-cost, trade creation dominates.
  • If preferential partners are relatively higher-cost, trade diversion dominates.

South Africa framing: In Southern African regional integration contexts, consider:

• diversity of production structures,
• industrial policy differences,
• transport and border costs affecting effective prices.

Section 5: Data Skills, Econometrics-Style Reasoning, and Exam Answer Construction (South African Institutions Clustered by Course Orientation)

To score well, you need not only theory but also exam technique: how to convert a question into model-based steps and how to present diagrams and welfare decompositions clearly. This section also links the content to the way South African universities, colleges, and TVETs commonly assess international economics topics—typically through short problem sets, diagram explanation, and scenario-based essays.

5.1 What to Memorize vs What to Derive Under Exam Pressure

A practical approach:

Memorize (high-frequency facts):

• welfare decomposition for tariff/quota,
• signs of effects on CA and output under floating vs fixed in Mundell–Fleming,
• RER definition and interpretation,
• Marshall–Lerner condition concept,
• J-curve timing intuition.

Derive on the spot:

• which BoP component must offset a deficit/surplus story,
• whether the currency appreciation supports or harms trade balance based on elasticity,
• how policy changes alter interest rates and net exports directionally.

Exam technique:
Write a “decision checklist” at the top of scratch paper (not in the final response):

1. Is it small or large economy?
2. Fixed or floating exchange rates?
3. Policy type: tariff/quota, fiscal, monetary?
4. Capital mobility assumption: low or high?
5. Ask: what happens to currency → net exports → CA → output?

5.2 Diagram Literacy: How to Draw Quickly and Correctly

For tariff:

• Draw a supply-demand diagram.
• Mark world price (P_w).
• Draw tariff wedge to (P_t = P_w + t).
• Shade:
  • consumer loss,
  • producer gain,
  • government revenue,
  • deadweight loss triangles.

For exchange rate policy:

• If your course uses IS–LM–BP or Mundell–Fleming graphs:
  • ensure axis labeling,
  • shift the correct curve (fiscal shifts IS),
  • incorporate capital mobility into BP behavior.

Common marking deductions:

• unlabeled axes,
• wrong curve shifting direction,
• missing final statement connecting to output and exchange rate.

5.3 Typical ECON3009-Style Question Patterns and How to Answer Them

Below are common patterns and structured responses.

Pattern 1: “Explain the effect of a tariff on welfare”

Answer structure:

1. State assumptions (small open economy).
2. Explain domestic price increase and quantity changes.
3. Provide welfare decomposition:
   • consumers lose,
   • producers gain,
   • government gains revenue,
   • deadweight loss.
4. Conclude: net welfare loss under standard assumptions.
5. Add distribution/real-world note: adjustment costs and political incentives.

Pattern 2: “Rand depreciation—what happens to the trade balance and current account?”

Answer structure:

1. Depreciation affects import and export prices (real exchange rate).
2. Short run: possible worsening due to contracts → J-curve.
3. Long run: quantity adjustment; depends on elasticities.
4. Mention pass-through/inflation channel and income effects.

Pattern 3: “Fiscal vs monetary policy under fixed vs floating”

Answer structure:

1. Identify exchange regime.
2. Specify capital mobility assumption.
3. State how fiscal/monetary affects interest rate and currency.
4. Translate currency movement into net exports and output.
5. Summarize with a concise conclusion sentence.

5.4 Worked Micro-Example: Tariff Welfare with Symbolic Areas

If numbers are absent, graders still reward a correct symbolic answer. Use a template:

• Let world price be (P_w), tariff be (t), so domestic price (P_t = P_w + t).
• Imports fall to (M_t).
• Government revenue = (t \times M_t).
• Deadweight loss = sum of production inefficiency triangle and consumption inefficiency triangle.

Then explain:

• production inefficiency: expanding domestic production beyond efficient level,
• consumption inefficiency: reducing consumption below efficient level.

This shows you understand the geometry of welfare changes.

5.5 “Cluster by Institution” Study Orientation (South Africa): University/College/TVET Course-Centric Notes

South Africa’s education ecosystem can differ in assessment style and emphasis. The cluster below treats each institution as a separate study orientation, focusing on specific course orientations that often correspond to international economics or international trade modules. The content remains fully consistent with the economic models above; the purpose is to help you map your study habits to how your course may be structured and assessed.

Important consistency note: The models and numerical claims used earlier are qualitative unless a question provides explicit figures. This guide avoids introducing unverifiable tariff rates, exchange-rate numbers, or specific marks for South African policies, because exam questions are typically problem-based rather than reliant on a single official statistic.

Cluster A: University of Cape Town (UCT) — ECON Course Orientation on Trade, Exchange Rates, and Policy Evaluation

Likely focus areas in assessments (common across economics degrees):

• diagram-based welfare analysis (tariffs/quotas),
• policy analysis with exchange-rate regimes,
• essays on distribution and policy implications.

How UCT-type assessment often rewards you:

• crisp diagram explanations,
• clear linking of theory to a macro narrative,
• evaluation of assumptions.

Study emphasis checklist:

1. Tariff/quota welfare decomposition: can you state each component and sign confidently?
2. Mundell–Fleming predictions: can you justify each direction (policy → interest rate → currency → output)?
3. Current account interpretation: can you consistently connect deficits to capital inflows?

Practice exam prompts you should self-generate:

• “Explain how a tariff affects welfare and why adjustment costs matter.”
• “Compare fiscal policy outcomes under fixed vs floating exchange rates with high capital mobility.”
• “Use the real exchange rate channel to discuss a currency depreciation’s likely impact on the current account.”

Cluster B: University of Johannesburg (UJ) — Applied International Economics Orientation with Policy Scenarios

Likely focus areas:

• integrating data reasoning (even if no formal regression is expected),
• scenario-based questions tied to exchange rate and balance of payments logic,
• interpreting policy effects in context.

Study emphasis checklist:

1. Balance of payments interpretation: can you state which BoP entries must move together?
2. Elasticity and timing: can you explain short-run vs long-run effects (J-curve and adjustment)?
3. Open-economy macro chains: do you always end with the direction of output and external balance?

Scenario drills:

• “Assume a country runs a current-account deficit financed by portfolio inflows. What happens if risk premia increase sharply?”
• “A depreciation occurs. Explain why imports may remain high in the short run but fall later.”

Cluster C: University of Pretoria (UP) — Theory-to-Application Orientation (Trade Theory and Welfare)

Likely focus areas:

• comparative advantage and factor-endowment reasoning,
• terms of trade and welfare under alternative assumptions (small vs large country),
• intra-industry trade and fragmentation discussions.

Study emphasis checklist:

1. Comparative advantage: opportunity cost logic and mutual gains.
2. H–O: factor abundance → pattern of trade.
3. Terms of trade/large country: explain why market power changes policy conclusions.
4. Global value chains: how intermediate goods alter policy incidence.

Essay exam prompts (typical style):

• “Discuss why trade liberalisation can improve national welfare while still increasing inequality within a country.”
• “Explain how global value chains complicate the interpretation of trade deficits.”

Cluster D: Stellenbosch University (SU) — International Trade and Macroeconomic Policy Evaluation

Likely focus areas:

• policy evaluation with welfare logic and distributional consequences,
• exchange rate regime analysis and external adjustment,
• critical discussion of trade policy effectiveness (infant industry, political economy).

Study emphasis checklist:

1. Infant industry: conditions for effectiveness and reasons failures occur.
2. Political economy: why protection persists despite welfare losses.
3. Exchange rates: real vs nominal and pass-through/inflation.

Debate-style questions:

• “Is infant industry protection justified? Evaluate using theory and risks.”
• “Under what conditions can a depreciation improve the current account?”

Cluster E: A TVET / College Context (e.g., Focus on Applied Trade and Macroeconomic Skills): South West Gauteng TVET College — Applied Open-Economy Reasoning

Likely focus areas in a TVET-style assessment (general pattern across TVETs):

• practical interpretation of trade and exchange rate concepts,
• structured responses using simpler diagrams and plain-language chains,
• short calculations with given numbers (if provided).

Study emphasis checklist:

1. Definitions and interpretation: RER, current account, BoP, tariff effects.
2. Directional reasoning: currency depreciation → import/export effects.
3. Diagram ability: label axes and explain welfare components.

Practice prompts:

• “Explain, step-by-step, what happens to a country’s current account when imports rise.”
• “Explain the welfare effects of a tariff using consumer/producer/government/deadweight loss language.”

5.6 Building High-Scoring Exam Answers: A Template You Can Reuse

Use this template regardless of the question type:

1. State assumptions (small/large, fixed/floating, capital mobility).
2. Identify the channel (prices, quantities, income, interest rates, risk premia).
3. Sign logic: predict direction for currency, net exports, CA, output.
4. Welfare or welfare distribution: consumers/ producers/ gov / DWL or winners/losers.
5. Time horizon if relevant: short run vs long run (J-curve).
6. Conclude in one sentence that directly answers the prompt.

Example conclusion styles (use as pattern):

• “Therefore, under standard small-country assumptions, the tariff reduces total welfare due to deadweight loss.”
• “Under floating exchange rates with high capital mobility, fiscal expansion appreciates the currency and can partially offset output gains via reduced net exports.”
• “A depreciation’s effect on the trade balance depends on elasticities and may be delayed due to contract lags (J-curve).”

5.7 Quick Reference: Model-to-Outcome Mapping (Memorize This)

Use this as a rapid revision tool.

Tariffs/Quotas (Small Open Economy)

• Tariff raises domestic price → imports fall.
• Consumers lose, producers gain, government gains revenue.
• Net welfare falls due to deadweight loss.

Exchange Rates and Policy (High Capital Mobility)

• Floating:
  • Monetary expansion → currency depreciation → output up (through net exports).
  • Fiscal expansion → currency appreciation → net exports down → output effect muted/offset.
• Fixed:
  • Monetary expansion not effective (peg defended).
  • Fiscal expansion → output up more strongly due to money supply response.

Current Account and BoP

• CA deficit financed by capital inflows (or reserve loss).
• CA surplus financed by capital outflows (or reserve gain).

5.8 Final Revision Checklist (Last 48 Hours)

To ensure retention and reduce exam-day mistakes:

• Rehearse one tariff diagram from scratch until it’s automatic.
• Rehearse one Mundell–Fleming scenario: fiscal under fixed vs floating.
• Rehearse one current-account interpretation: CA deficit → capital inflow.
• Rehearse one depreciation story including J-curve and elasticity dependence.
• Practice writing one full paragraph answering an essay prompt with:
  • assumptions,
  • channel,
  • directional result,
  • short justification.

Summary

ECON3009 International Economics succeeds when your answers are model-based, diagram-literate, and consistent about time horizons and sign logic. You should master open-economy measurement (BoP, current account, real exchange rate), trade theory (comparative advantage, H–O intuition, gains from trade), policy analysis (tariffs, quotas, welfare decomposition), and macro-exchange rate frameworks (Mundell–Fleming, depreciation timing, BoP crisis logic). Finally, you should use structured answer templates that explicitly state assumptions and link channels to the final conclusion—skills that align well with South African university-style and applied college/TVET assessment expectations.