Types of trade restrictions / methods of protection: import quotas

International trade and globalisation – Globalisation and trade restrictions

Types of trade restrictions / methods of protection: Import quotas

An import quota is a quantity limit that a government sets on how much of a particular good can be brought into the country each year. Think of it like a ticket reservation system for a popular concert: only a certain number of tickets can be sold, no matter how many people want to attend.

Exam tip: Remember that quotas are not a price-based restriction like tariffs. In exam questions, look for words such as “quantity” or “limit” to identify a quota.

How a quota works – A simple example

Suppose the UK government imposes a quota of 100,000 cars per year on imported cars. If the UK already has 200,000 cars available from domestic production, the quota effectively creates a shortage for imported cars.

  1. Domestic producers can supply up to 200,000 cars.

  2. Only 100,000 cars can be imported.

  3. Any extra demand for cars above 300,000 must be met by higher prices or by domestic production.

In this situation, the price of imported cars will rise because the supply is artificially limited.

Comparing quotas with tariffs

FeatureImport QuotaTariff
Type of restrictionQuantity limitPrice increase (tax on each unit)
Effect on priceHigher price if demand > quotaHigher price proportional to tariff rate
Revenue for governmentNone (unless quota is auctioned)Tariff revenue = rate × quantity imported

Why governments use quotas

  • 🛠️ Protect domestic industries from foreign competition.

  • 🚫 Limit imports of harmful goods (e.g., weapons, counterfeit products).

  • 📈 Stabilise local markets by preventing sudden surges in supply.

However, quotas can also lead to black markets and trade disputes because they restrict the free flow of goods.

Exam tip: When you see a question about a quota, check if it mentions “quantity” or “limit.” Then, think about how that limit would affect price and output in the market.

Quick maths: Calculating the quota effect

Suppose the demand for a product is given by \$D(p) = 500 - 2p\$ and the supply by \$S(p) = 3p\$. If a quota of 200 units is imposed, the price will adjust to satisfy the new supply constraint.

Set the supply equal to the quota: \$S(p) = 200\$ → \$3p = 200\$ → \$p = \frac{200}{3} \approx 66.67\$. The new equilibrium price rises from the free‑market price of 50 to about 66.67.

This simple calculation shows how a quota can push prices up, benefiting domestic producers but costing consumers more.

Exam tip: Practice setting up supply and demand equations and solving for price when a quota is given. Remember to check that the quota is binding (i.e., lower than the free‑market quantity).