The lesson
Explain the mechanism, then qualify the outcome. Use this page as a fast, high-quality revision pass—not a wall of notes to memorise.
How trade barriers work
Protectionism limits imports or gives domestic producers an advantage. The effect depends on the specific barrier.
- A tariff raises the domestic price of imported goods and generates government revenue.
- A quota restricts import quantity; its benefits may go to licence holders rather than the government.
- A subsidy can lower domestic producers’ costs but has an opportunity cost for taxpayers.
Arguments need context
Protection can protect infant industries, jobs or strategic sectors, but it can also reduce choice and create inefficiency.
- Domestic employment may be protected in the short run, but consumers can face higher prices.
- Retaliation can reduce export opportunities and harm other domestic industries.
- Evaluate the time period, the ability of a new industry to become competitive and the distribution of costs.
Worked exam thinking
Worked example: import tariff
Prompt: What happens when a country places a tariff on imported steel?
How to turn knowledge into marks
Use this answer route
For a focused explanation or short evaluation question on this topic:
- 1Define the core idea precisely.
- 2Explain the chain of cause and effect.
- 3Apply it to the context in the question.
- 4Evaluate a limitation, trade-off or condition.
Quick questions
Check your understanding
What is protectionism?
Government action that restricts imports or favours domestic producers.
What is the difference between a tariff and a quota?
A tariff is a tax on imports. A quota is a direct limit on the quantity of imports.
Why can protectionism be harmful?
It can raise prices, reduce competition, encourage retaliation and protect inefficient firms.