Import Quota
What is Import Quota?
An import quota is a legal limit on the quantity of a good that can be imported during a period.
By restricting supply, it raises the domestic price and protects domestic producers, much like a tariff but without government revenue. It reduces consumer surplus and creates deadweight loss. The price markup accrues to those holding import licenses.
Import Quota: a worked example
Domestic demand is Qd = 100 - 2P and domestic supply is Qs = 10 + P, both in thousands of units, with a world price of 20 dollars. Under free trade buyers take 60 thousand units while domestic firms supply 30 thousand, leaving imports of 30 thousand. Now cap imports at 12 thousand. The domestic price climbs until the gap equals the cap: (100 - 2P) - (10 + P) = 12, so 90 - 3P = 12 and P = 26. At 26 dollars consumption falls to 48 thousand and domestic output rises to 36 thousand. The 6 dollar markup on 12 thousand licensed units is 72 thousand dollars of quota rent. Deadweight loss is the production triangle ½(6)(6) = 18 plus the consumption triangle ½(12)(6) = 36, or 54 thousand dollars.
The mistake students make with import quota
Quota diagrams look identical to tariff diagrams, so students label the price markup rectangle as government revenue. A quota raises no revenue on its own. The 6 dollar gap between the world price and the domestic price, multiplied by the 12 thousand permitted units, becomes quota rent for whoever holds the import licences, often foreign exporters or well connected importers. Government captures that rectangle only when it auctions the licences. Write the rectangle as rent first, then say who receives it.
Import Quota questions
How is an import quota different from a tariff?
An import quota caps the physical quantity of a good allowed in, while a tariff taxes each unit and lets the quantity settle wherever buyers and sellers land. Both raise the domestic price, expand domestic output, and cut consumption. The sharpest difference appears as demand grows: a quota holds import volume fixed, so the domestic price keeps climbing, while a tariff leaves imports free to rise as long as buyers pay the tax on each extra unit.
When is an import quota binding?
A quota binds only when the cap sits below the quantity that would be imported under free trade. In the example above free trade brings in 30 thousand units, so a cap of 12 thousand bites and lifts the domestic price to 26 dollars. A cap of 40 thousand would sit above the free trade quantity, leave the price at the world price, and change nothing at all. Exam questions hide non binding quotas to see whether students check the free trade quantity first.
Does an import quota cause deadweight loss?
Quotas create two deadweight loss triangles. One comes from production, since high cost domestic firms replace cheaper imports, and one comes from consumption, since buyers priced out of the market lose surplus they valued above the world cost. Consumer surplus lost exceeds producer surplus gained plus quota rent captured, and the leftover is the deadweight loss. A quota can cost a country more than an equivalent tariff, because a tariff at least returns revenue to the public.
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