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Set out the gains from international trade and what it costs

CFA® Level I · Economics · International Trade · EC.8.a

The idea

Trade allows countries to specialise where they have a comparative advantage — the lowest opportunity cost, not necessarily the lowest absolute cost — which raises total output and lowers prices. Consumers gain variety and lower costs, and firms gain scale. The gains are aggregate, however, and the costs are concentrated: workers and regions tied to industries that lose out bear a real and lasting adjustment burden. That asymmetry, rather than any dispute about the aggregate arithmetic, is what makes trade politically contested.

A practice question

From the question bank, with the reason each wrong option is wrong.

What does comparative advantage describe?

  1. Producing a good at lower opportunity cost than another country — correct
  2. Producing a good at lower absolute cost than any other countryWhy not: That is absolute advantage, and trade can be mutually beneficial even when one country has it in everything.
  3. Having more natural resources than trading partnersWhy not: Resources are one source of advantage among many, and an abundance of them does not settle what a country should specialise in.

Comparative advantage turns on opportunity cost, which is why a country can gain from trade even when it is less efficient at producing everything.

A harder one

A country is more efficient than its partner at producing every good. Can trade still benefit both?

  1. No, absolute advantage in all goods removes the gainsWhy not: This is the classic mistake the theory was written to correct: what matters is relative cost, not absolute cost.
  2. Yes, provided their opportunity costs differ — correct
  3. Only if the partner subsidises its exportsWhy not: A subsidy would distort the terms of trade. The gains arise from differing opportunity costs without any such intervention.

As long as relative costs differ, each country can specialise where it gives up least and both end up with more. Absolute advantage across the board does not eliminate that.

The hardest tier

Why is trade politically contested even where the aggregate gains are agreed?

  1. Because the aggregate gains are usually negativeWhy not: The question stipulates the gains are agreed, and the standard finding is that they are positive.
  2. Because tariffs raise more revenue than income taxesWhy not: Tariffs are a minor revenue source in most developed economies, and revenue is not what drives the contest.
  3. Because gains are spread thinly while losses fall heavily on particular workers and regions — correct

A small price saving for many is barely noticed; a closed factory in a town with one employer is not. The distribution of the gains, not their existence, is what drives the politics.

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