Eurozone
The eurozone is the group of European Union countries that share the euro and monetary policy through the ECB.
Currency-union terms for optimal currency areas, single currencies, the eurozone, ERM, narrow-band ERM, and snake-in-the-tunnel arrangements.
Currency Unions and Monetary Integration explains exchange-rate measures, real and nominal currency values, currency regimes, pegs, floats, convertibility, devaluation, monetary standards, and capital controls used in finance.
Use these pages when currency movements, exchange-rate measurement, cross-border cash flows, country risk, or balance-of-payments pressure affects a finance decision. It sits inside Exchange Rates and Currency Regimes, so readers can move up when the broader economics context matters.
Use the table below to choose the narrower economics branch before applying a term to a model, credit view, market interpretation, policy conclusion, or risk review. Move into the term page when the evidence source, calculation, institution, market convention, or risk exposure matters.
| Area | Use it for |
|---|---|
| Exchange Rate Mechanism (ERM) | The exchange rate mechanism was a European currency arrangement that limited exchange-rate movements before monetary union. |
| Eurozone | The eurozone is the group of European Union countries that share the euro and monetary policy through the ECB. |
| Monetary Union | A monetary union is an arrangement in which countries share a currency, central bank, or closely coordinated monetary policy. |
| Narrow-Band ERM | A narrow-band ERM is an exchange-rate mechanism that allows currencies to move only within tight bands around agreed central rates. |
| Optimal Currency Area | An optimal currency area is a region where sharing one currency is economically efficient because adjustment costs are manageable. |
| Single Currency | A single currency is a shared monetary unit used across multiple jurisdictions, usually requiring common monetary governance. |
| Snake in the Tunnel | Snake in the tunnel was a European exchange-rate arrangement that kept participating currencies within narrow bands. |
Currency explanations are educational and do not recommend a trade, hedge, transfer, or country allocation.
Choose a subsection first. Deeper term pages live inside each subsection, which keeps large topic hubs readable.
The eurozone is the group of European Union countries that share the euro and monetary policy through the ECB.
The exchange rate mechanism was a European currency arrangement that limited exchange-rate movements before monetary union.
A monetary union is an arrangement in which countries share a currency, central bank, or closely coordinated monetary policy.
A narrow-band ERM is an exchange-rate mechanism that allows currencies to move only within tight bands around agreed central rates.
An optimal currency area is a region where sharing one currency is economically efficient because adjustment costs are manageable.
A single currency is a shared monetary unit used across multiple jurisdictions, usually requiring common monetary governance.
Snake in the tunnel was a European exchange-rate arrangement that kept participating currencies within narrow bands.