What are the advantages and disadvantages of a common currency?

Advantages of a common currency include reduced transaction costs, increased price transparency, and enhanced economic integration among member countries, which can stimulate trade and investment. However, disadvantages include loss of monetary policy autonomy, as individual countries cannot adjust interest rates or exchange rates to respond to local economic conditions. Additionally, economic disparities between member states can lead to imbalances and tensions, as weaker economies may struggle under a unified currency system.