AI Partner · ECO3024F · 2025

Your AI partner for
International Trade
& Finance

2nth.ai is embedded directly into ECO3024F — helping you master Krugman, Obstfeld & Melitz chapter by chapter, prep for tests, and sharpen your essay arguments.

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2nth · ECO3024F Tutor

Online · Specialised in Krugman et al.

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Hi! I'm your AI partner for ECO3024F. I know your syllabus, textbook, and assessment schedule inside-out. What would you like to work on today?

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Explain the Heckscher-Ohlin theorem simply

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Heckscher-Ohlin (H-O) theorem — Chapter 5 of Krugman et al.

Countries export goods that use their abundant factor intensively, and import goods that use their scarce factor intensively.

🇨🇳 China (labour-abundant) → exports labour-intensive goods (textiles, electronics assembly).
🇺🇸 USA (capital-abundant) → exports capital-intensive goods (aircraft, software).

Key formula: L/K > L*/K* → Home exports the labour-intensive good

Want me to walk through the Stolper-Samuelson effects next, or go to a practice exam question?

Stolper-Samuelson theorem

Purchasing power parity

Test 2 prep questions

Interest rate parity

✦ What 2nth.ai does

Your AI partner, not just a chatbot

Built specifically for ECO3024F — 2nth knows your syllabus, your assessment schedule, and the Krugman et al. textbook so you never study the wrong thing.

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Concept Explainer

Struggle with comparative advantage, exchange rate overshooting, or interest parity conditions? Get plain-English explanations with real-world examples, then go deeper with diagrams and derivations.

Chapters 1–20

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Quiz & Test Prep

Practice MCQs and short-answer questions in the exact style of your class quizzes and term tests. Instant feedback tells you why your answer is right or wrong, not just the score.

Tests 27 Mar & 12 May

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Essay Coach

The essay exam is 12% of your final mark. 2nth helps you structure arguments, cite the right theories, and avoid common pitfalls — all without doing the thinking for you.

12% of your mark

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Real-World Case Studies

Connect theory to live events — US-China tariff wars, South Africa's balance of payments, the rand's volatility, and BRICS+ trade flows. Make your exam answers stand out.

Applied Economics

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Assessment Tracker

Never miss a deadline. 2nth tracks your tutorials, quiz dates, and test schedule. Get personalised study plans based on your current grade weight and time remaining.

6 quizzes counted

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Tutorial Companion

Tutorials are weekly and pair-based — 5% of your mark across 8 hand-ins. 2nth helps you understand the question before you go in, so you can actually contribute.

5% of your mark

✦ Course structure

12 weeks, fully mapped

2nth.ai is aligned week-by-week to the ECO3024F teaching programme. Click any topic to start an AI-guided session.

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Part I: International Trade

Weeks 1–6 · Chapters 1–12 · Lecturer: Lawrence Edwards

Introduction & Ricardian Model

Comparative advantage, gains from trade, Ch. 2–3

Specific Factors Model

Short-run factor mobility, income distribution, Ch. 4

Heckscher-Ohlin Theory

Factor endowments, Stolper-Samuelson, Ch. 5

Standard Trade Model

Terms of trade, welfare effects, Ch. 6

Economies of Scale & Intra-Industry Trade

New trade theory, monopolistic competition, Ch. 7–8

Trade Policy: Tariffs & Subsidies

Welfare analysis, political economy, Ch. 9–12

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Part II: International Finance

Weeks 6–12 · Chapters 13–20 · Lecturer: Leigh Neethling

Balance of Payments & Current Account

National accounts, net foreign wealth, Ch. 13

Exchange Rates & Forex Market

Spot rates, interest parity, Ch. 14

Money, Interest Rates & Exchange Rates

LM model in open economy, monetary policy, Ch. 15

W10

Price Levels & Purchasing Power Parity

Absolute/relative PPP, Big Mac index, Ch. 16

W11

Output & Real Exchange Rate

DD-AA model, aggregate demand, Ch. 17

W12

Fixed Exchange Rates & Policy

Trilemma, currency crises, Ch. 18–20

✦ Assessment tracker

Know exactly where you stand

2nth tracks your assessments and helps you allocate study time where it matters most. The final exam is 50% — make it count.

Class Test 1

27 March · 1h 15min · In-person

14%

Completed — International Trade (Ch. 1–12)

Class Test 2

12 May · 1h 15min · In-person

14%

Upcoming — International Finance (Ch. 13–20)

Essay Exam

TBA · In-person at computer lab

12%

Date TBC — No medical exemptions granted

Tutorial Hand-ins

Best 8 of 10 · Weekly submissions

In progress — pair-based weekly workshops

Class Quizzes

Best 6 of 8 · Wed or Thurs · MCQ format

In progress — randomly scheduled, no exemptions

Final Examination

TBA · Semester-end · In-person

50%

Your biggest opportunity — 2nth helps you nail it

45%done

Semester in progress

45% of marks have been assessed.
55% still available — final exam dominates.

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2nth insight: Scoring 60% on your final exam alone can carry your grade significantly. Focus revision on Chapters 13–20 for Test 2, then build a comprehensive review plan for finals. Ask me to build your study schedule.

✦ How 2nth works

More than answering questions

2nth doesn't just retrieve facts — it reasons through problems with you the same way a great economics tutor would.

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Step-by-step model derivations

Walk through the Ricardian model, H-O factor endowments, or DD-AA analysis one step at a time, with diagrams explained in plain English.

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Exam-style question practice

Generate and grade practice questions in the format of ECO3024F's class tests — short-answer, graphical analysis, and essay-style responses.

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Current events linked to theory

Ask about today's trade news — tariff escalations, currency interventions, sanctions — and 2nth maps it to the exact chapter you're studying.

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Essay argument structuring

Given a topic, 2nth helps you build a thesis, select supporting theories from the syllabus, identify counterarguments, and structure your in-person essay response.

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Concept comparisons

Confused about absolute vs comparative advantage? Absolute vs relative PPP? 2nth builds side-by-side breakdowns so the differences actually stick.

Q: Walk me through the DD-AA model for open economy macroeconomics

The DD-AA model (Ch. 17) determines the short-run equilibrium output and exchange rate in an open economy.

            DD curve — goods market: combinations of (Y, E) where output = aggregate demand.

            Slopes upward: a depreciation (↑E) → ↑net exports → ↑aggregate demand → ↑Y.

            AA curve — asset markets: combines money market (LM) + forex market (UIP).

            Slopes downward: ↑Y → ↑money demand → ↑interest rate → currency appreciation (↓E).

Equilibrium where DD crosses AA gives you (Y*, E*).

E (exchange rate) │ DD │ / │ / ← Expansionary fiscal policy shifts DD right │ /\_____AA │/ └──────────────── Y (output)

Want me to show how a monetary expansion shifts this equilibrium?

Exam Q: "Explain why a small country cannot improve its terms of trade by imposing a tariff." (8 marks)

Model answer structure (per ECO3024F marking rubric):

            1. Define terms of trade (1 mark): ToT = P_exports / P_imports. A small country
            is a price-taker — it faces perfectly elastic foreign supply.
          

            2. Tariff mechanics (3 marks): A tariff raises the domestic price by the full
            tariff amount. But since the world price is unchanged, the small country absorbs all the cost.
            There is no terms-of-trade effect — only domestic distortion.
          

            3. Welfare conclusion (2 marks): Net welfare loss = Consumer surplus loss
            minus (Government revenue + Producer surplus gain). Production and consumption triangles both negative.
          

            4. Contrast with large country (2 marks): A large country can influence
            the world price (optimal tariff argument) — but not a small one.
          

Grade: 7–8/8 if you draw and label the supply-demand diagram.

Q: How do the 2025 US tariffs on Chinese goods relate to what we study in ECO3024F?

Great real-world application — examiners love this. Here's how it maps to your syllabus:

            Ch. 9 — Tariff analysis: The US is a large country. It can theoretically
            improve its terms of trade, but China's retaliatory tariffs eliminate this gain and create
            a deadweight loss for both economies.
          

            Ch. 10–11 — Political economy: Despite net welfare losses, concentrated
            producer gains (US steel, semiconductors) create political pressure for protection —
            exactly the "adding machine" model of trade politics.
          

            Ch. 14–15 — Finance side: The tariff shock caused USD/CNY volatility.
            China's partial exchange rate management (Ch. 18) prevented full currency adjustment.
          

This is excellent essay material. Want me to help you build a structured argument?

Essay topic: "Free trade is always welfare-improving." Discuss. (2025 essay prep)

2nth Essay Framework:

            Thesis (agree partially): Free trade increases aggregate welfare and efficiency
            gains (Ricardian, H-O models) but distributes gains unevenly, creating legitimate political
            economy arguments for managed trade.
          

Arguments FOR (Chs. 2–8):
• Ricardian gains: both countries gain even if one is absolutely inferior
• H-O welfare gains + consumer surplus gains from variety (Ch. 7)
• Economies of scale: intra-industry trade lowers costs

            Arguments AGAINST (Chs. 9–12):
            
• Stolper-Samuelson: scarce factor loses — income inequality
            
• Infant industry: temporary protection may be welfare-improving
            
• Terms-of-trade argument for large countries (optimal tariff)
            
• Strategic trade policy (imperfect competition)

Conclusion: Free trade maximises global welfare but requires redistribution mechanisms to be politically and socially sustainable.

Aim for ~800 words. Want me to drill into any section?

Your AI partner for International Trade& Finance