The central objective of the central bank, or monetary policy pursued by the central bankis price stability based on the assumption of neutrality of money to influence inflation.In this work we talk about unique monetary market that is eurozone. Until the formation of a common monetary policy it was necessary to go through long and hard journey but we can still say that final part of formation was on 01.01.2002. when currency euro started to implement in circulation. Benefits which connects with optimal currency area are bigger competitivness and productivity, greater liquidation, stable prices, markets are more connected, business risk and economic uncertainty are decreased. Entering in eurozone is one of more important goals of Croatia, but however to enter in the eurozone, Croatia needs to satisfy 4 conditions or criteria, known as Maastricht criteria or convergency criteria. Benefits wich Croatia gets entering eurozone are suspension of currency risk (biggest benefit), reduction in interest rate, lowe bank risk, while on tje other hand we have costs which connects with losing of independent monetary policy , risk of growing prices, excessive capital inflows and other. However numerous authors think the biggest lost would be losing Croatian national currency which represents the symbol of sovereignty and national identity –Croatian kuna.