Estonian kroon circulation. Coins in circulation before being replaced by the euro: Estonian kroon The kroon (sign: kr; code: EEK) was the official currency of Estonia for two periods in history: 1928–1940 and 1992–2011. Between 1 January and 14 January 2011, the kroon circulated together with the euro, after which the euro became the sole legal tender in Estonia. The kroon was subdivided into 100 cents ("senti"; singular "sent"). The word "kroon" (, “crown”) is related to that of the Nordic currencies (such as the Swedish krona and the Danish and Norwegian krone) and derived from the Latin word "corona" ("crown"). The
Economic and Monetary Union of the European Union eurozone member states and to impose flexible labour markets and flexible wages, might constitute a serious threat to Social Europe. In December 2012, at the height of the European sovereign debt crisis, which revealed a number of weaknesses in the architecture of the EMU, a report entitled ""Towards a genuine Economic and Monetary Union"" was issued by the four presidents of the Council, European Commission, ECB and Eurogroup. The report outlined the following roadmap for implementing actions being required to ensure the stability and integrity of the EMU: In June 2015, a follow-up report entitled ""Completing Europe's Economic and Monetary