Restriction on free trade (Trade and the Global Economy)

A tariff is a tax on imported goods (1). It raises the price of imports in the domestic market, which reduces the quantity of imports and raises revenue for the government (1).

An infant industry is a newly established domestic industry that is still small and has not yet reached the scale of its established foreign competitors (1). Because its costs per unit are high while it is small, it cannot yet compete with cheaper imports (1).

It might be given temporary protection — for example a tariff on rival imports — so that it can grow, increase output and benefit from economies of scale (1). As average costs fall it becomes able to compete on price, at which point the protection can be removed (1).

A tariff is a tax on imports. On a diagram, a small country faces a world price Pw at which foreign supply is perfectly elastic (a horizontal line), with domestic supply S sloping up and demand D sloping down.

Under free trade at Pw, domestic firms supply Q1 and consumers buy Q2, so imports are Q2 − Q1. The tariff raises the domestic price to Pw + t. Domestic supply now rises to Q3 (home firms expand as the price is higher) and consumption falls to Q4 (the higher price causes a contraction along demand). Imports therefore shrink to the smaller gap Q4 − Q3.

The government gains tariff revenue equal to the tariff per unit × the remaining imports (the shaded rectangle between Q3 and Q4). However, the tariff also creates a deadweight welfare loss — the two triangles — because the extra home output (Q1→Q3) is produced inefficiently and consumers lose surplus on the units they no longer buy (Q4→Q2). So a tariff cuts imports and raises domestic output and revenue, but at a net welfare cost.

Argument 1 — the infant-industry argument. A new domestic industry may be too small to compete with established foreign firms, whose larger scale gives them lower unit costs. By imposing a tariff on rival imports, the government raises the price of those imports, giving the young industry space to grow, increase output and reach economies of scale. As its average costs fall, it becomes able to compete on price, and the protection can then be removed. This can be justified where the industry has a genuine long-run prospect of becoming competitive.

Argument 2 — protecting employment. Cheaper imports can undercut domestic producers and cause job losses, especially where an industry is concentrated in one region. Protection defends output and jobs in that industry in the short run, preventing a sharp rise in structural unemployment and the associated regional decline and welfare costs.

Both arguments have real force in the short run, but each rests on the assumption that protection is temporary and well-targeted — that the infant industry really will grow up, and that the jobs saved are not simply offset by jobs lost elsewhere through retaliation or dearer inputs. Examining them shows the case for protection is conditional rather than automatic.

A tariff is a tax on imports that raises the domestic price of the imported good. On a tariff diagram, a small country faces a horizontal world price Pw (perfectly elastic import supply), with domestic supply S and demand D. Under free trade, domestic firms supply Q1 and consumers buy Q2, so imports are Q2 − Q1. The tariff lifts the price to Pw + t.

Impact on producers. At the higher price, domestic output expands from Q1 to Q3 and domestic producer surplus rises. The protected industry gains higher output, higher prices and, potentially, more jobs — this is the intended effect of the tariff.

Impact on consumers. Consumers now pay Pw + t rather than Pw, so consumption falls from Q2 to Q4. They face higher prices and less choice, and lose consumer surplus. Because the same higher price is paid on every unit, the loss is largest for lower-income households, making the tariff somewhat regressive.

Impact on the government. The government gains tariff revenue = tariff per unit × the remaining imports (Q3→Q4) — the shaded rectangle — which it can spend elsewhere.

Evaluation. First, the outcome depends on elasticity: if demand is inelastic, consumption falls little, so imports and the welfare loss shrink less and the tariff mainly raises price and revenue. Second, the tariff creates a net welfare loss — the two deadweight-loss triangles (inefficient extra home output Q1→Q3, and lost consumer surplus Q4→Q2) — so the consumer loss exceeds the producer gain plus revenue. Third, and most importantly, trading partners may retaliate, raising their own barriers and harming the country's export industries and jobs — potentially a trade war that leaves everyone worse off.

Judgement. A tariff clearly benefits the protected domestic producers and the government's revenue in the short run, but at the expense of consumers and overall efficiency. Whether it is worthwhile depends on the elasticity of demand, the size of the deadweight loss, and above all the risk of retaliation. It is most defensible as a temporary, targeted measure (e.g. a genuine infant industry) rather than as permanent protection, which tends to entrench inefficiency and provoke retaliation.

A tariff is a tax on imports that raises the domestic price of an imported good, reducing imports and expanding domestic output. Governments use tariffs to protect domestic industries — but whether this is a good idea is contestable, and this essay evaluates the case.

The case for tariffs. First, tariffs can protect infant industries: a new domestic industry, too small to compete with established foreign firms, can grow behind a temporary tariff, reach economies of scale and eventually compete unaided. Second, they can protect strategic industries (food, energy, steel, defence) so a country is not dependent on imports in a crisis. Third, they can defend employment in industries threatened by cheaper imports, avoiding sharp structural unemployment. Fourth, they can guard against dumping — foreign firms selling below cost to drive out rivals — and can help correct a current-account deficit by cutting the value of imports. Finally, they raise government revenue (tariff per unit × imports), which can be spent on other priorities. On a tariff diagram, the domestic price rises from the world price Pw to Pw+t, home output rises from Q1 to Q3, and the government collects the revenue rectangle on the remaining imports.

The case against tariffs. The central weakness is the net welfare loss. On the same diagram, consumers pay a higher price and consumption falls from Q2 to Q4, so the fall in consumer surplus exceeds the gain in producer surplus plus the tariff revenue by the two deadweight-loss triangles — a production distortion (inefficient extra home output, Q1→Q3) and a consumption distortion (lost surplus, Q4→Q2). Tariffs also mean higher prices and less choice for consumers and are often regressive. By sheltering inefficient firms they cause a loss of comparative advantage and weaker incentives to innovate — a misallocation of resources. Worst of all, tariffs invite retaliation: partners raise their own barriers, hitting export industries and jobs, and an escalating trade war can shrink world trade and leave every country worse off.

Evaluation. Whether tariffs are justified depends on the type of industry and the time horizon. The infant-industry and strategic arguments can justify temporary, targeted protection where there is a credible path to competitiveness or a genuine security need. But permanent, broad protection is hard to defend: it entrenches inefficiency, creates government failure (ministers picking winners and being captured by lobbies), and risks retaliation. The impact also depends on elasticity — with inelastic demand a tariff mainly raises price and revenue rather than cutting imports much. Alternatives such as producer subsidies (which expand home output without raising consumer prices) or supply-side policies that improve competitiveness at source may achieve the same goal at lower welfare cost.

Judgement. On balance, the case for tariffs is weak as a general policy but conditional in specific cases. Free trade and comparative advantage usually deliver higher output and lower prices, and the deadweight loss plus retaliation risk mean tariffs typically make an economy worse off overall. Tariffs are therefore best justified only as a temporary, well-targeted tool — for a genuine infant or strategic industry, with a credible exit plan — rather than as a standing means of protecting domestic industries against competition.