International Trade: Exports and Imports
Defines international trade as the exchange of goods and services between countries through exporting (selling abroad) and importing (buying from abroad), and outlines the main benefits this trade generates for consumers, businesses and economies. The key insight is that trade allows countries to access markets, resources and efficiencies unavailable through domestic production alone. Contains: text explanation of exports and imports, a table summarising the benefits of international trade, and a key-concept callout distinguishing exports from imports.
International trade is the process by which countries exchange goods and services across national borders. A country exports goods when it sells them abroad to buyers in other countries, and it imports goods when it buys them from producers based in other countries. This exchange happens because no country is able (or willing) to produce everything its population wants using only its own domestic resources, so trade allows countries to access goods, services and resources that would otherwise be unavailable or more costly to produce at home.
In a free trade diagram, a country becomes an exporter of a good when the world price is above the domestic equilibrium price -- domestic producers can sell abroad at the higher world price, and a surplus is exported. Conversely, a country becomes an importer of a good when the world price is below the domestic equilibrium price -- consumers can buy more cheaply from abroad, and the shortfall between domestic demand and domestic supply at that lower price is met through imports.
Export = a good or service produced domestically and sold to a buyer in another country (occurs when world price > domestic price).
Import = a good or service produced abroad and bought by a domestic buyer (occurs when world price < domestic price).
| Benefit | Explanation |
|---|---|
| Increased competition | Exposure to foreign firms pushes domestic businesses to improve quality and cut costs |
| Lower prices for consumers | Foreign firms entering the market increase competition, driving prices down |
| Greater choice | Consumers gain access to a wider range of products from different countries |
| Acquisition of resources | Countries can import resources unavailable domestically, expanding production capacity |
| Foreign exchange earnings | Exporting earns foreign currency, which can fund imports and other international transactions |
| Access to larger markets | Firms can sell beyond national borders, growing their customer base |
| Economies of scale | Selling internationally allows higher output, lowering the cost per unit produced |
| More efficient resource allocation | Global trade directs resources to where they are used most productively |
| More efficient production | Competitive pressure forces firms to streamline operations and boost output |
Together, exporting and importing form the basis of international trade: exports generate income and foreign exchange for the domestic economy, while imports give consumers and producers access to goods, services and resources that are not efficiently available at home. This two-way flow underpins all the wider benefits of trade described above.
- Export = selling domestically produced goods/services to another country
- Import = buying goods/services produced in another country
- A country exports a good when the world price is above its domestic price
- A country imports a good when the world price is below its domestic price
- Trade benefits include lower prices, greater choice, more competition, economies of scale, and access to resources and larger markets
Free Trade Diagram: Exports
Teaches how to draw and interpret a supply-demand diagram showing a country becoming an exporter under free trade when the world price sits above its autarky (no-trade) domestic price. The key insight is that the gap between quantity supplied and quantity demanded at the world price equals the export quantity, and domestic consumers lose surplus while domestic producers gain surplus. Contains: text explanation, a labelled diagram brief, a worked example walking through the construction, and an exam-tip callout on common labelling requirements.
When a country opens up to international trade, it compares its domestic price (the price that would prevail with no trade, set where domestic supply equals domestic demand) to the world price (the price at which the good can be bought or sold on international markets, assumed to be fixed because the country is a price taker). If the world price is above the domestic price, domestic producers can earn more by selling abroad than by selling only at home. The country becomes an exporter of that good.
At the world price (), domestic quantity supplied () exceeds domestic quantity demanded (). This excess supply is sold overseas — it is the country's export supply. Domestic firms now supply the whole market (home consumption plus exports), while domestic consumers face a higher price than they did before trade and therefore buy less than at the original domestic equilibrium.
Constructing the export diagram
- Draw the axes: price (P) on the vertical axis, quantity (Q) on the horizontal axis.
- Draw the domestic demand curve (D) sloping downward and the domestic supply curve (S) sloping upward; mark their intersection as the domestic (autarky) price and quantity .
- Draw a horizontal line at , above , representing the world price — horizontal because the country is assumed too small to affect the world price (it is a 'price taker').
- Read off quantity supplied at from the supply curve: call this (larger than , since a higher price encourages more domestic production).
- Read off quantity demanded at from the demand curve: call this (smaller than , since a higher price discourages some domestic consumption).
- Label the horizontal distance between and at the height of as 'Exports' — this is the quantity domestic producers sell abroad because it exceeds what domestic consumers wish to buy at that price.
Exam tip: On Paper 1 (a) diagram questions, always label both axes, both curves (S and D), the world price line (), the domestic price (), and the two quantities and at the world price. Marks are frequently lost simply for failing to label the export quantity (the gap between and ) explicitly, even when the diagram itself is drawn correctly.
Common mistake: Students often draw the world price line sloping or draw it below the domestic price by accident, which would depict an import scenario instead. Remember: exports occur when (world price above domestic price), and the world price line must be perfectly horizontal since the country is assumed to be a price taker unable to influence the world price.
- A country becomes an exporter when the world price () is above its domestic (no-trade) price ().
- The world price is drawn as a horizontal line because the country is assumed to be a price taker.
- Export quantity = quantity supplied domestically at minus quantity demanded domestically at ().
- At , domestic consumers demand less than at , while domestic producers supply more — the gap is exported.
- Always label both curves, both prices, both quantities, and the export gap for full AO4 marks.
Free Trade Diagram: Imports
Teaches how to draw and label a standard supply-demand diagram to show a country becoming an importer under free trade, when the world price is set below the autarky (no-trade) domestic price. The key insight is that this price gap creates a shortage at the world price, and imports are the horizontal distance filling the gap between domestic quantity demanded and quantity supplied. Contains: text explanation of the diagram's construction and logic, a labelled diagram image brief, a worked example walking through drawing the diagram step by step, and callouts on labelling conventions and a common mistake.
When a country opens up to free trade, it compares its domestic price (the equilibrium price that would prevail with no trade, sometimes called the autarky price) to the world price (the price at which the good is traded internationally, assumed fixed because the country is a price taker in world markets). If the world price is below the domestic price, domestic consumers can buy the good more cheaply from abroad than from domestic producers — so the country becomes an importer.
At the lower world price, domestic firms are only willing to supply a small quantity (since price has fallen, moving down the domestic supply curve), while domestic consumers want to buy a much larger quantity (moving down the domestic demand curve). This gap between quantity demanded and quantity supplied at the world price is filled by imports — foreign producers supply the difference.
When world price (Pw) < domestic price (Pd): quantity supplied domestically FALLS (movement down the supply curve) while quantity demanded RISES (movement down the demand curve). The horizontal distance between these two new quantities, measured along the world price line, IS the level of imports.
Drawing the import diagram step by step
- Draw and label axes: Price (P) on the vertical axis, Quantity (Q) on the horizontal axis.
- Draw a normal upward-sloping domestic supply curve (S) and downward-sloping domestic demand curve (D).
- Mark their intersection as the domestic (autarky) equilibrium: label the price Pd and quantity Qd on the axes.
- Draw a horizontal line representing the fixed world price, Pw, positioned BELOW Pd on the vertical axis -- this shows the country is a price taker facing a lower world price.
- Identify where Pw intersects the supply curve: drop a line down to the quantity axis and label this quantity Qs (domestic quantity supplied at the world price -- lower than Qd).
- Identify where Pw intersects the demand curve: drop a line down to the quantity axis and label this quantity Qd' (domestic quantity demanded at the world price -- higher than Qd).
- Draw a horizontal bracket or double-headed arrow along the Pw line from Qs to Qd', and label it 'Imports' -- this is the quantity the country imports from abroad.
Common mistake: Students often forget that BOTH the supply and demand quantities shift when price changes to Pw -- it is not just demand that changes. Imports are the horizontal distance between two different curves (Qs on the supply curve and Qd' on the demand curve) at the same world price, not simply the original Qd minus something arbitrary.
Exam tip: Always label your axes (P and Q), both curves (S and D), the domestic equilibrium (Pd, Qd), the world price line (Pw), and the two quantities where Pw crosses S and D. Clearly bracket or shade the import quantity and write 'Imports' next to it -- an unlabelled diagram, even if geometrically correct, will lose marks under AO4 criteria.
- A country becomes an importer when world price (Pw) is BELOW its domestic equilibrium price (Pd)
- At Pw, quantity supplied domestically falls to Qs while quantity demanded rises to Qd'
- Imports = the horizontal gap between Qs (on supply curve) and Qd' (on demand curve) at the world price line
- Always label axes, both curves, Pd/Qd, Pw, Qs, and Qd' -- and mark the import quantity explicitly
- This diagram mirrors the export diagram, but with Pw below rather than above Pd