Common Market

The Common Market is the nickname for the European Economic Community (EEC), created by the 1957 Treaty of Rome, which removed trade barriers and allowed goods, services, capital, and labor to move freely among member states, driving postwar recovery and the integration that led to the EU.

Verified for the 2027 AP European History examLast updated June 2026

What is the Common Market?

The Common Market is what people called the European Economic Community (EEC), the trade bloc six Western European countries (France, West Germany, Italy, Belgium, the Netherlands, and Luxembourg) created with the Treaty of Rome in 1957. The deal was simple but radical: scrap tariffs between members and let the "four freedoms" flow across borders. Goods, services, capital, and labor could all move freely, turning six separate national economies into one big shared marketplace.

For AP Euro, the Common Market is the middle step in a chain the CED spells out directly (KC-4.4.IV.A): the European Coal and Steel Community (1951) grew into the EEC/Common Market (1957), which grew into the European Union (1993). The deeper point is political, not just economic. After two world wars, European states deliberately set aside nationalist rivalries and bet that countries whose economies were tangled together wouldn't fight each other. It worked, and it also supercharged the postwar "economic miracle" already underway thanks to Marshall Plan funding.

Why the Common Market matters in AP Euro

The Common Market lives in Unit 9 (Cold War and Contemporary Europe), anchoring both Topic 9.2 (Rebuilding Europe After World War II) and Topic 9.10 (The European Union). It directly supports learning objective AP Euro 9.10.A, explaining how the EU's formation influenced economic development, and AP Euro 9.2.A, explaining how postwar economic developments drove political and cultural change. The CED's key concept KC-4.4.IV.A names the EEC/Common Market explicitly as the bridge between the ECSC and the EU, so you're expected to know this sequence. It also feeds into 9.10.B's sovereignty debates: free movement across borders, one of the issues behind Brexit, started as a Common Market principle. If you're writing about why postwar Western Europe recovered so fast or why a "shared European identity" emerged, the Common Market is your evidence.

How the Common Market connects across the course

European Economic Community (EEC) (Unit 9)

These are the same thing. "Common Market" is the everyday nickname for the EEC, the organization the Treaty of Rome created in 1957. On the exam, treat the two names as interchangeable.

Marshall Plan and the Economic Miracle (Unit 9)

Marshall Plan dollars rebuilt Western Europe's industry and infrastructure first (KC-4.2.IV.A), and the Common Market then kept the boom going by giving those rebuilt industries a huge tariff-free market to sell into. Recovery funded the growth; integration sustained it.

Adam Smith and Free Trade (Unit 4)

The Common Market is basically Adam Smith's argument against tariffs and mercantilism applied at continental scale. The Enlightenment idea that free exchange makes everyone richer became official European policy two centuries later, a great continuity point across periods.

Brexit and National Sovereignty (Unit 9)

The free movement of labor that Britain debated during Brexit traces straight back to the Common Market's four freedoms. KC-4.4.IV.B frames this as the central EU tension: members trade some national sovereignty for the benefits of integration.

Is the Common Market on the AP Euro exam?

The Common Market shows up most often in multiple-choice questions about European integration. Practice questions ask things like which treaty established the EEC (the Treaty of Rome, 1957), what the EEC's major goal was (economic integration through free trade among members), and why the Treaty of Rome was a significant development (it moved Europe from coal-and-steel cooperation toward full economic union). You need to do three things with this term. First, place it correctly in the sequence ECSC → EEC/Common Market → EU. Second, explain its purpose, which was both economic recovery and preventing another war by binding rivals together. Third, connect it to later sovereignty debates like the euro and Brexit. No released FRQ has used "Common Market" verbatim, but it's strong evidence for LEQs and DBQs about postwar recovery, the decline of nationalism in Western Europe, or continuity and change in European unity efforts.

The Common Market vs European Union (EU)

The Common Market (EEC) and the EU are different stages of the same project, not the same thing. The Common Market, created in 1957, was primarily an economic arrangement focused on free trade and the four freedoms. The EU, established by the Maastricht Treaty in 1993, absorbed the EEC and added political integration, including the euro, the European Parliament, and shared citizenship. If a question is about the 1950s-60s, say EEC or Common Market. If it's about the euro or Brexit, say EU.

Key things to remember about the Common Market

  • The Common Market is another name for the European Economic Community (EEC), created by the Treaty of Rome in 1957.

  • It allowed the free movement of goods, services, capital, and labor among member states, eliminating internal tariffs.

  • It sits in the middle of the integration chain the CED requires you to know: ECSC (1951) → EEC/Common Market (1957) → EU (1993).

  • Its purpose was double-sided, spurring postwar economic recovery while binding former rivals like France and West Germany together so war between them became unthinkable.

  • The Common Market reinforced the Marshall Plan-fueled economic miracle and helped build a shared European identity (KC-4.4.IV.A).

  • Its free-movement principle is the root of later sovereignty fights within the EU, including Brexit.

Frequently asked questions about the Common Market

What is the Common Market in AP Euro?

The Common Market is the nickname for the European Economic Community (EEC), the trade bloc created by the 1957 Treaty of Rome. Six founding members eliminated tariffs between themselves and allowed free movement of goods, services, capital, and labor.

Is the Common Market the same as the European Union?

No, but they're directly connected. The Common Market (EEC, 1957) was the economic stage; it evolved into the European Union in 1993 with the Maastricht Treaty, which added political integration like the euro and EU citizenship.

What treaty created the Common Market?

The Treaty of Rome, signed in 1957 by France, West Germany, Italy, Belgium, the Netherlands, and Luxembourg. This is a favorite multiple-choice fact, so know the date and the name.

How is the Common Market different from the European Coal and Steel Community?

The ECSC (1951) pooled only coal and steel production among the same six countries. The Common Market (1957) expanded that cooperation to the entire economy, covering all goods plus services, capital, and labor. Think of the ECSC as the pilot program and the Common Market as the full rollout.

Why was the Common Market created after World War II?

Two reasons: to speed up economic recovery by creating a large tariff-free market, and to prevent another European war by making member economies, especially France's and West Germany's, so interdependent that fighting would be self-destructive. The CED frames this as states setting aside nationalist rivalries for integration (KC-4.4.IV).