4.2 Types of trade protection

A tariff is a tax on imports that raises their domestic price and changes who buys, sells and receives income.

At the world price, consumers can buy the imported good cheaply. A tariff creates a wedge: the domestic price rises, quantity demanded falls, domestic supply rises, government collects revenue, and imports shrink.

Trace the price change first, then identify effects on consumers, producers, government and deadweight loss.

If the world price is 10 and a tariff of 2 is imposed, the domestic price tends toward 12 for a small open economy; buyers purchase less and local firms supply more.

A tariff is not paid only by foreign firms. Its incidence depends on elasticities and market power; domestic consumers often bear part of it.

An import quota is a legal quantity limit on imports, so domestic supply plus the permitted imports determines the market outcome.

With fewer imports available, the domestic price rises above the world price. Domestic producers expand, consumers lose surplus, and the scarce import licences create quota rents for whoever controls them.

Separate the quantity limit from a tariff: ask who receives the rent and whether the quota is binding at the world price.

A quota allowing 1,000 bicycles when firms would import 2,000 makes the remaining supply scarce; the price rises and licence holders may earn the difference between domestic and world prices.

A quota and a tariff can reduce imports by similar amounts but distribute rents differently and are not equivalent in every market.

A subsidy lowers a producer’s effective cost; an export subsidy additionally rewards sales abroad and can alter domestic availability and trade flows.

A domestic production subsidy can increase supply and lower price, but it uses government funds. An export subsidy encourages firms to sell abroad; domestic consumers may face a higher price or reduced availability, while fiscal cost and trade retaliation are possible.

Name the recipient, the market affected and the budget cost before calling a subsidy beneficial.

A government pays 3 per unit of solar panels produced. Output may expand and learning may lower costs, but taxpayers fund the payment and the result depends on whether the subsidy fixes a genuine spillover.

“Subsidy” does not mean free: the opportunity cost is public spending, and an export subsidy is not the same as a consumer discount.

For a domestic production subsidy in a small open economy, keep the consumer price at $P_w$ and shift domestic supply right/down by the per-unit subsidy: domestic output rises, imports fall, consumers are unchanged, producers receive $P_w+$ subsidy per unit and government cost equals subsidy × post-subsidy domestic output. The excess government cost beyond producer-surplus gain is a production deadweight-loss triangle. An export subsidy instead raises the return from exporting and can lift the domestic price, benefiting producers while harming domestic consumers and adding fiscal cost. Label which subsidy the diagram represents.

Administrative barriers restrict trade through rules, procedures or standards rather than a stated tax or numerical import limit.

Licensing delays, local-content rules, technical standards and customs procedures can raise the time or cost of supplying a foreign market. They may protect safety or consumers, but they can also conceal protectionism and reduce competition.

Ask whether the rule targets a genuine risk, whether it is proportionate, and whether foreign and domestic suppliers face comparable requirements.

A food-safety certificate may reduce contamination risk; a needlessly duplicated certificate can make an imported product uncompetitive without improving safety.

Not every trade rule is protectionism. The relevant distinction is the rule’s purpose, evidence and effect on market access.

Protection calculations compare the world-price outcome with the protected outcome to measure changes in quantities, surplus, revenue and welfare.

In a tariff diagram, the price rises by the tariff amount, domestic production and consumption change, and government revenue is the tariff multiplied by the quantity imported after protection. The two small welfare triangles represent deadweight losses when the protected quantities are inefficient.

Label every area and quantity before calculating: consumer loss, producer gain, government revenue and the net welfare change are different objects.

If a tariff is 2 and post-tariff imports are 300 units, government revenue is 600 currency units. That revenue is not automatically equal to the welfare loss; compare all surplus changes.

Do not calculate revenue from pre-tariff imports or treat the producer-surplus gain as the country’s net gain.

Apply the same area discipline to all three instruments. For a quota, quota rent equals $(P_q-P_w)\times Q_{imports}$; who gains depends on licence ownership, while net welfare loss is the production- and consumption-distortion triangles. For a production subsidy, government cost equals subsidy per unit × post-subsidy domestic output; consumers retain the world price, producers gain, imports fall and the production-distortion triangle is the net welfare loss. For a tariff, revenue remains tariff × post-tariff imports. In every case use rectangle $=\text{price wedge}\times\text{quantity}$ and triangle $=\tfrac12\times\text{price wedge}\times\text{quantity change}$, then sum transfers and losses without double counting.