# The Global Economy

> IB Economics SL · IB SL Economics
> Source: https://www.owlsprep.com/study/ib-economics-sl-u4-overview/
> Weight: 30% of overall IB Economics SL exam

This unit explores how national economies interact through international trade, currency markets, and global integration, connecting cross-border exchange patterns to long-term economic growth and development.

**Prerequisites:** [Foundational knowledge of supply-demand analysis, national income accounting, and core macroeconomic policy](https://www.owlsprep.com/study/ib-economics-sl-u3-overview/)

## Learning objectives

- Explain core economic principles that drive international trade and cross-border economic interaction
- Evaluate the impacts of trade protection policies and different exchange rate systems on national and global outcomes
- Analyze the structure and meaning of balance of payments accounts and terms of trade movements
- Discuss the relationship between globalization, economic growth, and inclusive sustainable development

## Unit at a Glance

This unit follows a logical progression from the fundamentals of why countries trade, to the barriers and policies that shape trade flows, to how currencies are valued and national trade accounts are measured, ending with a discussion of how global integration impacts long-term development. A unifying theme across all topics is evaluating the trade-offs between open global markets and domestic economic stability.

The unit is split into 9 linked sub-topics, building from core theory to policy analysis to development outcomes:
- [Benefits of international trade](https://www.owlsprep.com/study/ib-economics-sl-u4-benefits-of-international-trade/) — Introduces the core economic gains countries achieve from specializing and trading with other economies.
- [Comparative advantage](https://www.owlsprep.com/study/ib-economics-sl-u4-comparative-advantage/) — Explores the key theory that explains which goods a country should produce and trade with others.
- [Trade protection](https://www.owlsprep.com/study/ib-economics-sl-u4-trade-protection/) — Covers different types of trade barriers and evaluates their economic impacts and supporting arguments.
- [Exchange rates](https://www.owlsprep.com/study/ib-economics-sl-u4-exchange-rates/) — Explains different exchange rate systems and how currency values are determined in global markets.
- [Balance of payments](https://www.owlsprep.com/study/ib-economics-sl-u4-balance-of-payments/) — Breaks down the structure of the balance of payments account and what it measures for an economy.
- [Terms of trade](https://www.owlsprep.com/study/ib-economics-sl-u4-terms-of-trade/) — Defines terms of trade and explains what drives changes in a country's terms of trade over time.
- [Economic development](https://www.owlsprep.com/study/ib-economics-sl-u4-economic-development/) — Distinguishes between economic growth and economic development, and common measures of development.
- [Sustainable development](https://www.owlsprep.com/study/ib-economics-sl-u4-sustainable-development/) — Explores the environmental and social dimensions of long-term, inclusive development.
- [Globalization](https://www.owlsprep.com/study/ib-economics-sl-u4-globalization/) — Evaluates the costs and benefits of increasing global economic integration for different types of economies.

## Common pitfalls

- **Wrong:** Confusing absolute advantage with comparative advantage when explaining trade patterns.
  - Why it fails: Absolute advantage focuses on overall productivity, while comparative advantage relies on opportunity cost, which is the actual basis for gains from trade.
  - Correct: Always use opportunity cost to calculate comparative advantage and identify which goods a country should export.
- **Wrong:** Mixing up the classification of transactions between the current and financial accounts of the balance of payments.
  - Why it fails: IB exam questions regularly test knowledge of account classifications, and mixing these up leads to lost easy marks.
  - Correct: Remember current account covers trade in goods/services and income transfers, while the financial account covers cross-border purchases and sales of assets.
- **Wrong:** Assuming an improvement in a country's terms of trade is always economically beneficial.
  - Why it fails: Terms of trade improvements can stem from negative factors like commodity price spikes that raise domestic costs, and can harm trading partners.
  - Correct: Always evaluate the source of a terms of trade change to determine its overall impact on an economy.

## Cheatsheet

| Concept | Key Formula / Definition |
| --- | --- |
| Comparative Advantage | Lower opportunity cost of producing a good relative to another country |
| Terms of Trade | $\text{ToT} = \frac{\text{Index of average export prices}}{\text{Index of average import prices}} \times 100$ |
| Balance of Payments | Current Account + Capital Account + Financial Account = $0$ |
| Gains from Trade | Increased consumer choice, lower prices, and higher overall consumption possibilities for all trading countries |
| Tariff Impact | Raises domestic price, reduces imports, generates government revenue, creates net deadweight loss |
| Floating Exchange Rate | Currency value determined purely by market supply and demand |
| Fixed Exchange Rate | Currency value pegged to another currency, maintained by central bank intervention |
| Human Development Index (HDI) | Composite development measure combining life expectancy, education, and per capita income |
| Sustainable Development | Development that meets current needs without compromising the ability of future generations to meet their own needs |

## What's next

Begin your study of this unit with the first sub-topic, which introduces the core rationale for international trade and lays the foundation for all subsequent topics in this high-weight unit. Once you complete all 9 sub-topics here, you can move on to exam preparation and revision for the full IB Economics SL syllabus.

- [Benefits of international trade](https://www.owlsprep.com/study/ib-economics-sl-u4-benefits-of-international-trade/)
- [Trade Protection](https://www.owlsprep.com/study/ib-economics-sl-u4-trade-protection/)

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