This paper deals with the analysis of the economic effects of the introduction of the euro as the official currency in the Republic of Croatia, with a special focus on changes in the prices of goods and services after this monetary transition. The first part of the paper describes in detail the process of introducing the euro, including the key stages, the regulatory framework, and the institutional measures taken to ensure price stability and consumer protection. Special attention was paid to the identification and analysis of factors that contributed to price growth, such as inflationary expectations, psychological reactions of consumers and entrepreneurs, changes in the cost structure, and possible abuses in the price rounding process. For the purpose of a deeper analysis, a comparative study was conducted that compares price movements in Croatia with Italy, Germany and Slovenia, countries that also went through the process of introducing the euro. This comparative analysis made it possible to identify similarities and differences in market responses to the introduction of new value, taking into account the specific economic and institutional contexts of each country. In addition to price analysis, the paper also investigates inflation dynamics in the observed countries during the transition period, in order to assess the long-term macroeconomic effects of the replacement of national currencies with the euro. The results of the research indicate a complex set of factors that have influenced the growth of prices in Croatia, while certain unique aspects specific to the Croatian market have been identified. A comparison with other countries showed that, although there are common trends, the Croatian experience of introducing the euro is also characterized by certain special challenges, which resulted in specific patterns of price changes. These findings can serve as a basis for further research on the long-term effects of the introduction of the euro and the possibilities of mitigating negative inflationary pressures.