"This paper revisits the debates that have surrounded the launch of a unique experience: the adoption of a common currency among developed countries. A striking aspect of this history is that, pressed by what they correctly identified as a window of opportunity, policy-makers crafted this complex project in a short period of time, largely eschewing inputs from the academic profession. Academic research, in turn, developed its own views, which turned out to be critical of some ley orientations, yet it generally recognizes that, in the end, the launch of the euro has been a major success." Copyright CEPR, CES, MSH, 2006.