Revise Free trade and protectionism for IB Economics (4.2)

The case for free trade

• Lower prices — imports and import competition push prices down, raising consumer surplus and real incomes.

• Greater choice — consumers and firms gain access to a far wider range of goods, services, inputs and technologies than any one economy could produce alone.

• Competition and efficiency — exposure to foreign rivals forces domestic firms to cut costs and innovate (greater productive and allocative efficiency), rather than shelter behind a captive home market.

• Economies of scale — producing for a world market rather than a domestic one lets firms operate at larger scale and lower average cost.

• Comparative advantage — specialisation according to opportunity cost raises total world output; the resulting gains can be shared through trade. (Numerical comparative-advantage analysis is HL.)

The tools of protectionism

• Tariffs — a tax on imports. Raises the domestic price of the import, cuts the quantity imported, and generates revenue for the government. The tool with the fullest welfare diagram (analysed below).

• Quotas — a physical limit on the quantity that may be imported. Restricting supply raises the domestic price, but the extra revenue (quota rent) is captured by the private importers who hold the licences, not the government.

• Production subsidies — a per-unit payment to domestic producers. It lowers their costs and shifts the domestic supply curve to the right, letting them supply more without the price to consumers necessarily rising — but it has an opportunity cost to the government budget.

• Administrative / regulatory barriers — non-tariff barriers such as complex safety, health, labelling, environmental or licensing requirements. They raise the cost and delay of importing, discouraging imports without an explicit tax or quantitative limit.

The tariff welfare diagram — reading the areas

• Domestic price and quantity — price rises from $P_w$ to $P_w + t$; imports fall from ($Q_{D1} - Q_{S1}$) to ($Q_{D2} - Q_{S2}$).

• Consumers lose — consumer surplus shrinks by the whole area between $P_w$ and $P_w+t$ up to the demand curve. Consumers are the biggest losers: they pay more and consume less.

• Domestic producers gain — producer surplus expands by the area to the left, between the two prices and above the domestic supply curve (they sell more, at a higher price).

• Government gains revenue — the RECTANGLE only: tariff per unit $t$ multiplied by the quantity STILL imported after the tariff ($Q_{D2} - Q_{S2}$). Not the whole price-rise band.

• Deadweight welfare loss — the TWO triangles left over: a production-inefficiency triangle (higher-cost domestic output $Q_{S1}\!\to\!Q_{S2}$ replaces cheaper imports) and a consumption-inefficiency triangle (consumers priced out, $Q_{D2}\!\to\!Q_{D1}$). Together they are the net loss to society.

Worked example 2 — quota vs tariff, and the quota rent

Arguments FOR protectionism

• Infant industry — a new industry may need temporary shelter to reach the scale and experience needed to compete. But: governments struggle to pick winners, and 'temporary' protection is politically hard to remove.

• Protecting jobs — barriers can save jobs in industries hit by cheap imports. But: they raise costs for downstream firms and consumers, can cost jobs elsewhere, and often merely delay necessary adjustment.

• Anti-dumping — protection can counter foreign firms selling below cost to drive out rivals. But: genuine dumping is hard to prove, and 'anti-dumping' is easily abused as disguised protection.

• Strategic / national security — a country may protect industries vital in wartime (steel, energy, food, semiconductors) to guarantee supply. But: 'strategic' is elastic and invites lobbying by industries that are not truly essential.

• Correcting a current-account deficit — restricting imports can narrow a deficit. But: it treats a symptom not the cause, invites retaliation that hits exports, and can raise input costs and inflation.

Arguments AGAINST protectionism

• Higher prices and less choice — consumers pay more and buy from a narrower range, cutting real incomes; the burden falls hardest on low-income households.

• Net welfare (deadweight) loss — as the tariff diagram shows, the loss to consumers exceeds the gains to producers and the government; society is worse off overall.

• Inefficiency — sheltered firms face weaker pressure to cut costs and innovate, entrenching productive inefficiency and a misallocation of resources away from comparative advantage.

• Retaliation and trade wars — trading partners often respond in kind, so protected exporters lose overseas markets and interdependence turns a domestic policy into a shared loss.

• Hurts developing-country exporters — barriers in rich markets can block the very exports that developing economies rely on to grow.

Common mistakes examiners penalise

• Mislabelling government revenue on the tariff diagram — revenue is the RECTANGLE (tariff x quantity STILL imported), not the whole area between $P_w$ and $P_w+t$, and not the producer-gain area.

• Forgetting there are TWO deadweight-loss triangles — one for production inefficiency and one for consumption inefficiency; naming only one, or calling a rectangle a 'deadweight loss', loses marks.

• Saying a quota gives the government revenue — it gives quota rent to private licence holders; only a tariff gives the government revenue. This is the single most tested tariff-vs-quota point.

• Claiming 'everyone loses' or 'everyone gains' from a tariff — be precise: producers and the government gain, consumers and foreign exporters lose, and society suffers a net loss. Identify each group.

• One-sided evaluation — for a part (b) command like 'Evaluate' or 'Discuss', listing only costs (or only benefits) caps you below the top band. You must weigh both sides and judge.

• Asserting a diagram instead of explaining it — a drawn-but-unexplained diagram is described, not analysed; link each labelled area to the argument in words.

Key concepts in this lesson