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In recent decades, countries have increasingly formed regional trading blocs — groups of countries that agree to reduce or eliminate trade barriers among themselves. This lesson examines the different levels of economic integration, evaluates their advantages and disadvantages, and considers key real-world examples including the European Union and USMCA.
Bela Balassa (1961) identified five stages of economic integration, each representing a deeper level of cooperation:
| Stage | Features | Example |
|---|---|---|
| 1. Preferential trade area | Members reduce (but do not eliminate) tariffs on each other's goods | Generalised System of Preferences (GSP) |
| 2. Free trade area (FTA) | Members eliminate tariffs and quotas between themselves but maintain independent trade policies towards non-members | USMCA (formerly NAFTA), EFTA |
| 3. Customs union | FTA + members adopt a common external tariff (CET) on goods from non-members | EU customs union, Mercosur |
| 4. Single (common) market | Customs union + free movement of labour, capital, goods, and services (the "four freedoms") | EU Single Market |
| 5. Economic and monetary union | Single market + common currency and harmonised economic policies | Eurozone (20 EU members sharing the euro as of 2023) |
Key Definition: A customs union is a trading bloc in which member countries eliminate tariffs between themselves and impose a common external tariff on imports from non-member countries.
Exam Tip: A common exam question asks you to distinguish between a free trade area and a customs union. The key difference is the common external tariff — in a free trade area, each country sets its own tariffs on non-members; in a customs union, all members apply the same external tariff.
The economic impact of trading blocs was analysed by Jacob Viner (1950), who introduced the concepts of trade creation and trade diversion.
Occurs when joining a trading bloc causes a shift from a higher-cost domestic producer to a lower-cost member-country producer. This improves allocative efficiency and increases welfare.
Example: Before joining the EU, the UK may have produced wine domestically at high cost. After joining, it imported cheaper French wine (tariff-free), benefiting consumers.
Occurs when joining a trading bloc causes a shift from a lower-cost non-member producer to a higher-cost member-country producer, because the common external tariff makes non-member goods more expensive.
Example: If the UK previously imported cheap New Zealand lamb, but the EU's common external tariff made New Zealand lamb more expensive than French lamb, trade is diverted from a more efficient producer (New Zealand) to a less efficient one (France). This reduces welfare.
Key Definition: Trade creation occurs when a trading bloc enables a shift from a high-cost to a low-cost source of supply. Trade diversion occurs when a trading bloc causes a shift from a low-cost external supplier to a higher-cost member supplier due to the common external tariff.
A trading bloc is welfare-enhancing overall if the trade creation effects exceed the trade diversion effects. Whether this is the case depends on:
The EU is the world's most advanced example of economic integration, combining a customs union, single market, and (for eurozone members) monetary union.
| Feature | Detail |
|---|---|
| Members | 27 countries (after UK departure in 2020) |
| Single Market | Free movement of goods, services, capital, and labour |
| Common External Tariff | Applied to all imports from non-EU countries |
| Common policies | Common Agricultural Policy (CAP), Common Fisheries Policy, competition policy |
| Eurozone | 20 members (as of 2023) share the euro |
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