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EC311 · Intermediate Microeconomics

EC311 / TOPIC 26

7.4 Trade, tariffs and quotas

How do an equivalent tariff and quota differ in who receives the rent?

World price opens trade; restrictions raise domestic price, transfer surplus, and destroy some gains from trade.

Follow the cause and effect

  1. At Pw, find Qd, Qs, and imports.

  2. For a small country, tariff price is Pw+t; quota price makes the import gap equal the cap.

  3. Identify the quota-rent recipient before comparing welfare.

The model you are using

KEY MODEL
Qd=100−P
Qs=P−20
Pw=30
M=Qd−Qs

Conditions for this model

Small competitive country, no transport costs or externalities, and a nonprohibitive tariff.

The exam trap

Quota and tariff welfare match only when rent stays domestic and market conditions are equivalent.

Connect the reasoning to the graph

What changes

  • Consumer loss splits into producer gain, revenue or rent, and two DWL triangles.

What stays fixed

Small competitive country, no transport costs or externalities, and a nonprohibitive tariff.

Keep these conditions throughout the comparison; change only what the case above specifies.

What to inspect

Identify the quota-rent recipient before comparing welfare.

Compare before and after, and locate the conclusion on the graph.

5 MINUTES · TRANSFER THE IDEA

Can you explain it without the lesson?

Explain the difference when quota licenses go to foreign exporters rather than being auctioned.

Lesson references

  • Pindyck & Rubinfeld, Microeconomics, 9th Global ed., pp. 351
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