Single Market: The single market refers to the free movement of goods, services, capital, and people among EU member countries without internal barriers like tariffs or quotas.
Eurozone: The eurozone consists of EU member countries that have adopted the euro as their official currency. They share monetary policy under the European Central Bank.
Supranationalism: Supranationalism refers to the delegation of power and authority from national governments to international organizations like the EU. It involves pooling sovereignty for common decision-making.