Unit Overview

The Global Economy

IB Economics Higher Level· 6 min read 📊 25-30% of total exam

1. Unit at a Glance

This unit follows a logical flow from the core theory of why countries trade, to barriers to trade, then international finance, then broader topics of economic integration, globalisation and development. Core topics are required for both SL and HL candidates, with additional quantitative and advanced analysis topics reserved for HL only.

You will build from theoretical foundations to real-world evaluation, learning to apply models to assess policy choices and their distributional impacts across different economies and population groups.

This unit includes the following core and HL-only sub-topics, ordered to build your knowledge incrementally:

Gains from international trade

Introduces core arguments for and expected outcomes of free trade between nations.

★★⏱ 5 min

Comparative advantage theory

Explains the opportunity cost basis for mutual gains from trade between countries.

★★★⏱ 6 min

Protectionism

Covers different types of trade barriers and arguments for and against protecting domestic industries.

★★⏱ 5 min

Exchange rate determination

Explains how floating and fixed exchange rates are determined in foreign exchange markets.

★★★⏱ 6 min

Balance of payments

Introduces the structure and components of a country's balance of payments accounts.

★★★⏱ 5 min

Terms of trade

Defines the terms of trade and explains factors that cause it to change over time.

★★★⏱ 4 min

Economic integration

Covers different levels of economic integration between blocs of countries.

★★⏱ 5 min

Globalisation and its impacts

Evaluates the economic, social and environmental impacts of increasing global integration.

★★★⏱ 7 min

Economic development and sustainability

Explores the difference between economic growth and development, and the role of sustainability.

★★★⏱ 6 min

Development strategies and foreign aid

Assesses different strategies to promote development and the role of aid and debt relief.

★★★⏱ 7 min

Exchange rate systems (HL only)

Analyzes the features, advantages and disadvantages of different exchange rate systems.

★★★★⏱ 6 min

Terms of trade calculations (HL only)

Covers how to calculate and interpret changes in the terms of trade over time.

★★★⏱ 4 min

Balance of payments adjustment (HL only)

Explores how economies adjust to balance of payments disequilibrium under different systems.

★★★★⏱ 6 min

Global economy quantitative analysis (HL only)

Covers application of key models to solve Paper 3 style quantitative problems.

★★★★⏱ 7 min

2. Common Pitfalls

Wrong move:

Confusing absolute advantage with comparative advantage when evaluating gains from trade

Why:

Absolute advantage refers to lower absolute production cost, while comparative advantage is based on opportunity cost, which is the correct basis for mutual gains from trade

Correct move:

Always base trade gain analysis on comparative advantage (opportunity cost) rather than absolute production efficiency

Wrong move:

Mixing up current account and capital/financial account components in balance of payments

Why:

Many students misclassify transactions, leading to incorrect analysis of balance of payments imbalances

Correct move:

Remember the current account tracks trade in goods/services and income flows, while the financial account tracks cross-border asset transactions

Wrong move:

Assuming free trade always benefits all groups in an economy

Why:

While aggregate gains from free trade are common, they often come with concentrated losses for import-competing industries and their workers

Correct move:

Always evaluate distributional impacts when assessing the outcomes of trade policy changes

3. Quick Reference Cheatsheet

Concept/Key Formula	Summary
Opportunity cost (comparative advantage)	$O C_{g oo d A} = \frac{U ni t s o f g oo d B g i v e n u p}{U ni t s o f g oo d A p r o d u ce d}$
Terms of Trade (ToT)	$T o T = \frac{I n d e x o f e x p or t p r i ces}{I n d e x o f im p or t p r i ces} \times 100$
Balance of Payments Identity	$C u r r e n t A cco u n t + C a p i t a l A cco u n t + F inan c ia l A cco u n t = 0$
Comparative advantage	Ability to produce a good at lower opportunity cost than another country
Free Trade Area vs Customs Union	FTA has free internal trade, customs union adds a common external tariff
Depreciation	Fall in value of a currency under a floating exchange rate system
Human Development Index (HDI)	Composite measure of development covering health, education, and average income
Current account deficit	Value of imports of goods/services > value of exports of goods/services

What's Next

Begin your exploration of this unit with the foundational sub-topic on gains from international trade, completing sub-topics in the listed order to build your understanding incrementally. Once you finish all core and HL-only sub-topics in this unit, you can proceed to the next unit in the IB Economics HL syllabus to continue your exam preparation.