Restrictions on free trade — Edexcel A-Level Economics A
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Restrictions on free trade explained
This topic examines four ways governments restrict free trade.
Read the full explanation
A tariff is a tax on imports, raising the domestic price and reducing import volume. A quota is a physical limit on the quantity of a good that may be imported, creating scarcity and raising price. A subsidy to domestic producers lowers their costs, allowing them to cut price and compete against imports. Non-tariff barriers include rules, standards, customs delays and licensing that raise the cost or difficulty of importing without being a tax. For each type, learn the mechanism: who pays, how price and quantity change, and which group gains or loses. Use a simple diagram or numerical example to show the effect on domestic price, import quantity and government revenue where relevant.
Your focus
- Define and distinguish tariffs, quotas, subsidies to domestic producers and non-tariff barriers.
- Explain the mechanism by which each restriction affects domestic price and import quantity.
- Compare the effects of each restriction on consumers, producers and government revenue.
Restrictions on free trade exam tips
Marking Points
- A tariff is a tax on imported goods that raises the domestic price and reduces the quantity imported.
- A quota is a physical limit on the quantity of a good that can be imported, restricting supply and raising domestic price.
- A subsidy to domestic producers lowers their costs of production, enabling them to lower price and compete with imports.
- Non-tariff barriers are non-tax measures such as standards, licensing, customs procedures or administrative rules that restrict imports.
- Each restriction changes the domestic price, quantity imported and welfare of consumers, producers and government in a distinct way.
Examiner Tips
- 💡For each restriction, state the mechanism in one sentence: who pays or receives, and how price and quantity change.
- 💡Use a numerical example or simple diagram to show the effect on domestic price and import quantity for a tariff and a quota.
- 💡When comparing, link each restriction to its effect on consumers, producers and government revenue, not just to trade volume.
Common Mistakes
- Confusing a tariff with a quota: a tariff is a tax that raises revenue and price, while a quota is a quantity limit that may create scarcity rents rather than government revenue.
- Treating a subsidy to domestic producers as a tax on imports: a subsidy is a payment that lowers domestic producers' costs, not a charge on foreign goods.
- Assuming all non-tariff barriers are illegal or informal: many are legal regulations such as health, safety or environmental standards that also restrict trade.
- Ignoring that a quota can raise domestic price without generating government revenue, unlike a tariff.