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Premium experiment • trade policy and import wedges

ECONOMICS • INTERNATIONAL TRADE

Tariffs, World Price & Deadweight Loss

Explore tariffs, world prices and deadweight loss. See how an import tariff raises the domestic price, reduces imports, increases tariff revenue and creates efficiency losses.

● TARIFF WEDGEworld price → tariff price → imports
Free-trade imports
Imports after tariff
Tariff revenue
Deadweight loss

Reasoning inspector

live model state
Free-trade imports—
Imports after tariff—
Domestic price—
Tariff revenue—
Production DWL—
Consumption DWL—

Experiment with the mechanism

A tariff raises the domestic price above the world price when the country is small enough not to affect world prices. Domestic producers expand, consumers buy less, imports shrink and the government collects tariff revenue. The two lost-trade triangles are the production and consumption components of deadweight loss.

LEARN WITH THE SIMULATION

Understand Tariffs, World Price & Deadweight Loss by experimenting.

START HERE

A tariff is a tax on imports. In the small-country model used here, the world price is taken as given, so the tariff raises the domestic price by the tariff amount. That changes incentives on both sides of the market: domestic producers supply more, consumers demand less, imports shrink, the government collects revenue, and some mutually beneficial trades disappear.

BUILD THE IDEA

What you should understand first

  • Compare the free-trade outcome with the tariff outcome at the same world price.
  • Separate the tariff's effects on domestic producers, consumers, imports and government revenue.
  • Identify the two sources of deadweight loss created by distorted production and consumption decisions.

TRY IT YOURSELF

What happens when the tariff rises while the world price and domestic curves stay fixed?

  1. Record free-trade imports, domestic production and domestic consumption.
  2. Increase the tariff and replay the world-price and tariff-price stages.
  3. Compare the new domestic supply and demand quantities with the free-trade quantities.
  4. Inspect tariff revenue and the two deadweight-loss components.
Read the visual:

The higher tariff raises the domestic price. Producers expand because the domestic price is more attractive, consumers reduce purchases because the good is more expensive, and imports fall because the gap between domestic demand and supply narrows.

WHY IT WORKS 01

Why free trade creates an import gap

At the world price, domestic consumers decide how much they want to buy and domestic producers decide how much they want to supply. If domestic demand is greater than domestic supply, the difference is imported. Imports therefore are not a separate demand curve in this simple diagram. They are the gap between two domestic quantities evaluated at the same market price.

WHY IT WORKS 02

Why a tariff creates two efficiency losses

The tariff raises the domestic price above the world price. Higher-cost domestic production expands even though some of those extra units could have been imported more cheaply, creating a production distortion. At the same time, some consumers stop buying even though their willingness to pay was above the true world resource cost, creating a consumption distortion. Those are the two deadweight-loss triangles.

WHY IT WORKS 03

Why government revenue does not cancel the deadweight loss

Tariff revenue equals the tax per imported unit multiplied by the number of units still imported. That revenue remains inside the domestic economy as a transfer from buyers to the government. Deadweight loss is different: it measures gains from trade that disappear entirely because the tariff changes behavior. Transfers redistribute surplus, while deadweight loss destroys some of the total surplus available.

DO NOT MIX THESE UP

Common misconception

Tariff revenue is not the same as an efficiency gain. Revenue is a transfer to the government, while deadweight loss comes from trades and production choices that no longer maximize total surplus. The small-country model also assumes the tariff does not push down the world price, which may not hold for a very large importing country.

PRACTICE CHALLENGE

Can a tariff raise government revenue while total surplus still falls?

  • Start with a positive import level and a moderate tariff.
  • Raise the tariff and record government revenue.
  • Observe how domestic production, domestic consumption and imports change.
  • Explain why the revenue transfer cannot recover the two sets of trades lost at the margin.
Reveal the reasoning

Yes. A tariff can generate substantial government revenue because imported units are still taxed. But the tariff also causes domestic producers to replace some lower-cost imports and causes consumers to stop buying some units whose willingness to pay exceeded the world resource cost. Those lost gains from trade are not transferred to anyone, so total surplus falls even though the government receives revenue.

MODEL BOUNDARIES

What this simulation assumes

Every simulation simplifies reality or a mathematical system. These are the assumptions and limits to keep in mind while interpreting the results.

Model assumptions

  • The country is small enough that its tariff does not change the world price.
  • Domestic demand and supply are linear.
  • The tariff is a fixed per-unit import tax and imports remain possible after the tariff.

Model limitations

  • Large-country terms-of-trade effects, quotas, retaliation, customs costs and exchange-rate responses are omitted.
  • The model focuses on partial-equilibrium welfare effects in one market.

CONNECT IT

Where this matters

  • International trade policy
  • Import protection
  • Trade-war analysis
  • Consumer and producer surplus

WORDS THAT MATTER

Key vocabulary

World price
The international price the country can trade at in the small-country benchmark.
Tariff
A tax imposed on imported units.
Imports
Domestic quantity demanded minus domestic quantity supplied when demand exceeds supply.
Deadweight loss
Total surplus lost because the tariff distorts production and consumption decisions.