Chapter 14 · International trade: Part I
Export subsidy
Explain how an export subsidy raises domestic price and expands exports. Identify government expenditure, changes in surplus and welfare loss.
The economic idea
International trade is the exchange of goods and services between economies. An exporting country produces more of a good than it consumes domestically and sells the difference abroad. In this small-country model, the country takes the world price as given.
Trade protection is government intervention that supports domestic producers or limits foreign competition. An export subsidy is a government payment on each unit sold abroad. A production subsidy instead pays on eligible domestic output, including units sold at home.
When firms can sell in either market, domestic buyers must match the return from exporting, including the subsidy. The domestic price therefore rises. Firms increase quantity supplied and consumers reduce quantity demanded along their unchanged curves, leaving more output available for export.
Consumer surplus measures the benefit consumers receive above what they pay; producer surplus measures producers’ receipts above the minimum they would accept. A government payment can redistribute surplus, but it is not itself a measure of deadweight welfare loss. Without an offsetting external benefit, the extra production and lost domestic consumption create a net national welfare loss.
Follow the export incentive through the domestic market
“Quantity” is measured horizontally and “Price” vertically.
“D domestic” is domestic demand, “S domestic” domestic supply and “Pworld” the price available in international trade.
The free-trade benchmark
At “Pworld”, domestic supply “Qs₁” exceeds domestic demand “Qd₁”. The excess production is exported; exports are the horizontal difference between those quantities.
Why the domestic price follows the export return
The export payment raises the return from selling abroad. Producers will not supply domestic buyers for less than that return, so the domestic price rises to “Pw + subsidy” above “Pworld”. This creates movements along unchanged “S domestic” and “D domestic”, not a shift of domestic demand.
Domestic purchases and export availability
Domestic production increases from “Qs₁” to “Qs₂” and domestic consumption decreases from “Qd₁” to “Qd₂”. The gap between “Qs₂” and “Qd₂” is therefore wider: exports increase. Producers gain from the higher return, while domestic consumers lose from the higher price.
Read the government-expenditure rectangle
Government expenditure is the per-unit subsidy multiplied by exports after the subsidy, not all domestic production. Draw its rectangle using the vertical subsidy wedge and the horizontal gap between domestic production and consumption after the policy. The fiscal rectangle is not itself the net national welfare loss.
Locate the two welfare-loss triangles
The production loss lies between “Qs₁” and “Qs₂”, bounded by “S domestic” and “Pworld”. These extra units cost more to produce than their value at the world price.
The consumption loss lies between “Qd₂” and “Qd₁”, bounded by “D domestic” and “Pworld”. Domestic buyers give up units whose benefit exceeds the world price. Add these two losses; do not shade all government expenditure as deadweight loss.
Does exporting more make the country better off?
Producers benefit, but domestic consumers pay more and taxpayers finance the subsidy. In the basic model, the producer gain is smaller than the combined consumer loss and government expenditure. A claim that the policy is worthwhile needs an additional benefit, such as a supported learning effect, large enough to outweigh those costs.
For an evaluation question, explain who gains and loses, the opportunity cost of public spending and whether more targeted support could meet the objective. Use evidence from the question or a relevant real-world example to support your judgement.
Common mistakes to avoid
- An export subsidy is not a domestic discount. Domestic consumers face a higher price in this model.
- The subsidy is paid on exported units, not all output. A larger export volume is not by itself a net national welfare gain.
- Do not call the whole government-expenditure rectangle deadweight loss; identify the production and consumption distortions separately.
How to draw this diagram
- Label Price and Quantity; draw “D domestic” and “S domestic” with “Pworld” above the autarky price so the country exports.
- Mark domestic consumption and production at the world price; identify the export gap between them.
- For an active export payment, draw “Pw + subsidy” above “Pworld” by the payment per unit and read the new domestic quantities. For no payment, do not invent a distinct higher-price outcome.
- Identify government expenditure using post-policy exports and draw welfare-loss boundaries only where the marginal production and consumption distortions occur.
Assumptions and limitations
- The economy is assumed unable to influence the world price; possible large-country terms-of-trade gains are omitted.
- Foreign retaliation, dispute settlement, exchange-rate adjustment and global value chains are not shown.
- The curves are static and omit learning, innovation, firm entry and exit, unemployment duration and regional adjustment.
- Externalities, security benefits and distributional objectives require evidence outside a conventional surplus diagram.
- Administrative costs, evasion, corruption, licence allocation and lobbying can materially change policy outcomes.
- The export-return mechanism assumes output can move between foreign and domestic sales without binding trade restrictions or transaction barriers.