The present research was intended to study the effects of the euro introduction on the Romanian market. After becoming a member of the European Union, the next step for Romania is to adopt the common currency. The present target for this is the period 2014 - 2015. Using a progessive approach, the study analyzes the effects of replacing the national currency with the euro. First are analyzed the five nominal criteria taken into account for entering the ERM II. Afterwards are analyzed the real and structural criteria and the possible alternative adjustment mechanisms that may replace the monetary policy. There were generated several possible scenarios using an econometric approach. In the end is taken into consideration the problem of Romania's competitiveness on international markets.