EFB336 Chap.5 Tariffs, Quotas and Trade Intervention
Tariffs, Quotas and Trade Intervention
A trade intervention changes the link between world and domestic prices. A tariff raises the domestic price by a tax wedge in the small-country case, encouraging domestic production, discouraging consumption and reducing imports. Consumer loss is divided among producer gain, government revenue and two deadweight-loss triangles.
A quota can reproduce the quantity effect, but its rent may accrue to domestic licence holders, the government or foreign exporters, making allocation central to comparison.
What this chapter covers
- 01
Small-country free-trade equilibrium
- 02
Tariff price and quantity effects
- 03
Consumer and producer surplus
- 04
Government revenue and deadweight loss
- 05
Quota rents and licence allocation
- 06
Terms-of-trade and political-economy arguments
Worked example · free
Compute tariff deadweight loss
- +1Production distortion equals 0.5 × $5 × 12 = $30.
- +1Consumption distortion equals 0.5 × $5 × 8 = $20.
- +1Total deadweight loss equals $30 + $20 = $50.
- +1Revenue is a transfer within the importing country and is therefore kept separate from these efficiency costs.
Key terms
- Consumer surplus
- The difference between willingness to pay and the amount buyers actually pay.
- Quota rent
- The value created by the gap between the restricted domestic price and the import purchase price.
- Deadweight loss
- A reduction in total surplus that is not offset by a gain to another domestic participant.
Tariffs, Quotas and Trade Intervention FAQ
Why does a tariff create two triangles?
The higher domestic price induces production by suppliers whose marginal cost exceeds the world price and prevents consumption valued above the world price. Those are separate production and consumption distortions. Transfers to producers and government must be removed before identifying the net efficiency loss.
Are a tariff and quota equivalent?
They can produce the same import quantity under stable demand and supply, but the destination of quota rent matters. They also differ when demand changes: a tariff fixes the wedge while import quantity adjusts, whereas a binding quota fixes quantity and lets the domestic price move.
Can a large country gain from a tariff?
A country with market power may push down the foreign export price and improve its terms of trade. That possible gain must exceed domestic distortion losses, and foreign retaliation can erase it. The small-country diagram does not include this channel because world prices are treated as fixed.
Exam move
Make the small-country diagram your base case and build every variation from it. Start with domestic supply and demand, draw the fixed world price and identify free-trade production, consumption and imports. Add the tariff as a vertical price wedge. Trace the new domestic price into higher supply, lower demand and fewer imports before shading any welfare area.
Construct a ledger with consumer loss on one side and producer gain, government revenue, production distortion and consumption distortion on the other. Check that the parts exhaust the consumer change. For numerical work, use only the tariff-induced quantity change as each triangle base: one half times the wedge times the rise in domestic production, plus one half times the wedge times the fall in consumption.
Use post-tariff imports for the revenue rectangle. Next, convert the case into a quota. Hold the import quantity at the tariff outcome and identify the same scarcity wedge, then ask who owns the import licences. Auction revenue remains domestic public revenue; licences allocated to importers create domestic private rent; licences captured by foreign exporters transfer rent abroad.
Change demand after the quota is imposed and compare the resulting price movement with a tariff that keeps the per-unit wedge fixed. Keep the large-country argument in a separate panel. A country with purchasing power may lower the foreign export price, producing a terms-of-trade gain, but domestic distortions and partner retaliation remain.
Practise one policy paragraph for each claimed objective: infant-industry learning, employment, revenue, bargaining power or national security. Name the market failure, explain why the border instrument addresses it and compare a more targeted alternative. End each answer with incidence.
Consumers, protected producers, downstream users, taxpayers, licence holders and foreign exporters need not experience the same outcome, so a national welfare total never substitutes for the distributional account.
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