6.1 The Reasons for International Trade


2026 Syllabus Objectives

By the end of this subtopic, you should be able to:

  1. Explain the difference between absolute advantage and comparative advantage
  2. Describe the benefits of specialisation and free trade, including the Trading Possibility Curve (TPC)
  3. Understand exports, imports, and the terms of trade — including how they are measured, what causes them to change, and what impact those changes have
  4. Explain the limitations of the theories of absolute and comparative advantage

1. Absolute Advantage vs Comparative Advantage

Why Do Countries Trade?

Countries around the world are good at producing different things. Some countries have fertile land perfect for farming; others have advanced technology for manufacturing. Instead of trying to produce everything themselves, countries specialise — they focus on making the things they are best at — and then trade with other countries for everything else.

Two important theories help us understand which country should produce what: Absolute Advantage and Comparative Advantage.


Absolute Advantage

A country has an absolute advantage when it can produce more of a good than another country using the same amount of resources (e.g. the same number of workers). In other words, it is simply more efficient at producing that good.

Example:

Suppose Country X and Country Y each have 100 workers, split equally (50 on each good):

CountryFood producedClothing produced
Country X30 units15 units
Country Y10 units20 units
World Total40 units35 units
  • Country X produces more food than Country Y → Country X has an absolute advantage in food
  • Country Y produces more clothing than Country X → Country Y has an absolute advantage in clothing

After specialisation (each country uses all 100 workers on what they're best at):

CountryFood producedClothing produced
Country X60 units0 units
Country Y0 units40 units
World Total60 units40 units

World output rises from 40+35=75 units to 60+40=100 units. Both countries can trade and end up with more than before. This is the key benefit of specialisation.

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