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Trade Creation, Trade Diversion and Monetary Union
IB DP Economics — Unit 4: The Global Economy | HL | 4.4 Economic Integration
📋 What You Will Learn
- Define economic integration and distinguish between its stages: preferential trade agreements, free trade areas, customs unions, common markets, and monetary unions
- Explain the concepts of trade creation and trade diversion and analyse their welfare effects using diagrams
- Evaluate whether a customs union or free trade area produces a net welfare gain or loss for member and non-member countries
- Explain the features of a monetary union and analyse the costs and benefits of adopting a common currency
- Apply the theory of optimum currency areas to evaluate the suitability of monetary union for a group of countries
- Evaluate the Eurozone as a real-world case of monetary union, identifying both its achievements and structural tensions
🔍 Guiding Question When countries integrate their economies — removing trade barriers and eventually sharing a currency — do the gains from closer cooperation outweigh the costs of surrendering economic independence?
🌍 Why This Matters In 2023, the United Kingdom's trade with the European Union fell sharply following Brexit — the UK's exit from the EU's single market and customs union. UK goods exports to the EU dropped by an estimated 6–7% compared to a counterfactual scenario of remaining in the EU, while trade with non-EU partners grew only modestly. Meanwhile, nineteen EU member states continued sharing the euro, navigating the tension between a single monetary policy set by the European Central Bank and very different national economic conditions. These two stories — one about trade integration, one about monetary union — sit at the heart of this topic.
Stages of Economic Integration
Economic integration is not a single event — it is a spectrum. Countries can choose how deeply they wish to integrate, with each stage involving greater surrender of economic sovereignty in exchange for deeper market access.
📖 Definition — Economic Integration Economic integration refers to the process by which countries reduce or eliminate trade barriers and coordinate economic policies, creating a more unified economic area. Integration can be partial (e.g. a free trade area) or deep (e.g. a monetary union).
The Stages of Integration — From Shallow to Deep
- Preferential Trade Agreement (PTA): member countries reduce (but do not eliminate) tariffs on each other's goods — the shallowest form of integration. Each country retains its own trade policy with non-members.
- Free Trade Area (FTA): all tariffs and quotas between members are eliminated, but each member keeps its own external tariff against non-members. Example: USMCA (US, Canada, Mexico). Rules of origin are required to prevent trade deflection.
- Customs Union: an FTA plus a common external tariff (CET) applied uniformly by all members against non-members. Example: the European Union's customs union. No rules of origin needed internally.
- Common Market: a customs union plus free movement of all factors of production (labour, capital, enterprise) across member borders. Example: the EU's Single Market.
- Economic Union: a common market plus harmonised economic policies (fiscal, regulatory, competition). Example: the EU moves toward this but is not fully there.
- Monetary Union: an economic union plus a single shared currency and a single central bank setting monetary policy. Example: the Eurozone (19 → 20 member states since Croatia joined in 2023).
💡 Key Distinction for Exams The IB syllabus focuses particularly on the customs union (for trade creation and trade diversion analysis) and the monetary union (for costs and benefits of a common currency). Make sure you can distinguish these clearly and apply the correct analysis to each.
Trade Creation
When a country joins a customs union, it removes tariffs on imports from member countries. This changes where it sources its imports — and whether those changes improve or worsen economic welfare is the central question of trade creation and trade diversion analysis.
📖 Definition — Trade Creation Trade creation occurs when, following the formation of a customs union, a country switches from buying a good from a high-cost domestic producer to buying it from a lower-cost producer in a member country. It represents a welfare gain: consumers pay lower prices and resources are reallocated toward more