International trade — OCR A-Level Economics

International trade is the exchange of goods and services across national borders. For OCR A-Level Economics, this topic explores why countries trade, the benefits and costs of trade, and the policies that governments use to control it. You'll study classical theories like comparative advantage, which explains how countries gain from specialising in what they produce relatively more efficiently, even if they are less efficient overall. This topic also covers modern trade patterns, the role of the World Trade Organization (WTO), and the impact of trading blocs like the European Union (EU).

Understanding international trade is crucial because it shapes global economic growth, consumer prices, and employment. For example, trade allows the UK to import tropical fruits and export financial services, raising living standards. However, trade can also create winners and losers, such as domestic industries that struggle against foreign competition. This topic connects to microeconomics (e.g., market structures, efficiency) and macroeconomics (e.g., balance of payments, exchange rates). You'll need to evaluate arguments for free trade versus protectionism, using real-world examples like US-China trade tensions or Brexit.

In the OCR exam, international trade appears in both multiple-choice and essay questions. You might be asked to explain comparative advantage with a numerical example, discuss the impact of a tariff on consumer surplus, or evaluate whether free trade always benefits developing countries. Mastering this topic requires you to apply economic models (e.g., production possibility frontiers) and use precise terminology like 'terms of trade' and 'trade creation'. Strong answers also consider dynamic efficiency gains and the role of multinational corporations (MNCs).

• →Comparative advantage: A country has a comparative advantage if it can produce a good at a lower opportunity cost than another country. This is the basis for mutually beneficial trade, even if one country is absolutely more efficient in all goods.
• →Protectionism: Government policies to restrict trade, such as tariffs (taxes on imports), quotas (limits on quantity), and subsidies to domestic industries. These protect domestic jobs but raise prices for consumers.
• →Balance of payments: A record of all transactions between a country and the rest of the world. The current account includes trade in goods and services, and a deficit means imports exceed exports.
• →Terms of trade: The ratio of export prices to import prices. An improvement means a country can buy more imports for the same amount of exports, which benefits living standards.
• →Trading blocs: Groups of countries that agree to reduce trade barriers among themselves, such as free trade areas (e.g., NAFTA), customs unions (e.g., EU), or single markets. They can lead to trade creation (switching to lower-cost producers) or trade diversion (switching to higher-cost bloc members).

• Characteristics of perfect competition
• Short run perfect competition: supernormal profit/loss
• Long run perfect competition: normal profits
• Individual firm as a price taker
• Equilibrium price and output for a firm in perfect competition
• Allocative efficiency in short run and long run
• Productive efficiency in long run

• 💡Ensure you can distinguish between the short-run and long-run outcomes for firms in perfect competition.
• 💡Be prepared to explain why firms in this structure are price takers.
• 💡Practice drawing diagrams for both short-run (supernormal profit/loss) and long-run (normal profit) equilibrium.
• 💡Always use numerical examples to illustrate comparative advantage. For instance, show that if the UK produces 1 car per 10 hours and 1 computer per 5 hours, while Germany produces 1 car per 8 hours and 1 computer per 4 hours, Germany has an absolute advantage in both, but the UK has a comparative advantage in computers (lower opportunity cost).
• 💡When evaluating protectionism, consider both static and dynamic effects. For example, tariffs may protect infant industries in the short run but can lead to retaliation and inefficiency in the long run. Use real-world examples like US steel tariffs.
• 💡Link trade to other topics like exchange rates. For instance, a depreciation of the pound makes UK exports cheaper and imports more expensive, which can improve the trade balance. Show this with a diagram of the foreign exchange market.

• Misconception: Comparative advantage means a country can produce a good more efficiently than another. Correction: Comparative advantage is about lower opportunity cost, not absolute efficiency. A country can have a comparative advantage in a good even if it is less efficient at producing it.
• Misconception: Free trade always benefits all workers. Correction: While free trade increases overall economic welfare, it can cause job losses in industries that face import competition. Workers may need to retrain or move to expanding sectors.
• Misconception: A trade deficit is always bad for the economy. Correction: A trade deficit can reflect strong domestic demand and investment. For example, the UK often runs a deficit but attracts foreign capital, which finances investment.