Facts that should be reaffirmed. The euro is regarded as a fact of life that cannot be ignored and a decisive factor in European construction, not only because of the reasons indicated in this column yesterday but also because it helps Europe get its voice heard in the wider international debate on global financial regulation. Europe's voice will only be heard if the EU speaks as a whole and has its own currency. It is true that in international bodies such as the G20 or the IMF, European...