Can someone explain comparative advantage vs. absolute advantage with a clear example?

Comparative advantage is one of the most counterintuitive but important concepts in economics. Let's use a concrete example that makes the logic clear.

Absolute vs. Comparative Advantage

• Absolute advantage: Country A produces a good using fewer resources than Country B
• Comparative advantage: Country A produces a good at a lower opportunity cost than Country B

The Key Insight: Even if one country is better at producing everything, both countries benefit from trade if they specialize in their comparative advantage.

Example: Fernwood and Greyport

Production per worker per year:

Fernwood has absolute advantage in BOTH goods (more output per worker). So why would Fernwood trade with Greyport?

Calculate Opportunity Costs:

Fernwood:

• 1 car costs 50/10 = 5 garments forgone
• 1 garment costs 10/50 = 0.2 cars forgone

Greyport:

• 1 car costs 12/3 = 4 garments forgone
• 1 garment costs 3/12 = 0.25 cars forgone

Comparative Advantage:

• Greyport has comparative advantage in cars (opportunity cost = 4 garments vs. Fernwood's 5)
• Fernwood has comparative advantage in textiles (opportunity cost = 0.2 cars vs. Greyport's 0.25)

Gains from Trade:

If the countries trade at a rate of, say, 1 car = 4.5 garments:

• Greyport produces extra cars (costs them 4 garments each) and trades for garments at 4.5 → net gain of 0.5 garments per car
• Fernwood produces extra garments (costs them 0.2 cars each) and trades for cars at 1/4.5 = 0.222 → net gain of 0.022 cars per garment

Both countries are better off, even though Fernwood was more productive in absolute terms.

Real-World Application:

Why does the US import clothing from Bangladesh even though the US has more advanced manufacturing? Because the US has a much larger comparative advantage in high-tech goods, pharmaceuticals, and financial services. The opportunity cost of using American labor to make clothing is extremely high.

CFA Exam Trap:

• Don't confuse absolute and comparative advantage — a country can have absolute advantage in everything but NOT comparative advantage in everything
• Trade benefits both parties as long as they have different opportunity costs
• The terms of trade must fall between the two countries' opportunity costs for both to gain

Practice more trade theory with our CFA Level I community.