Berlin is at last having to deliver on the Faustian bargain made by Germany's political class when it swapped the D-Mark for French acquiescence in reunification. It must either go the whole way towards EMU fiscal union and take responsibility for Italy's public debt (111pc of GDP by next year), Austria's loans to Eastern Europe (70pc of GDP), the adventures of Ireland's 'Canary Dwarf' (€400bn or so in liabilities), and Spain's housing collapse (1m unsold homes), or jeopardize its half-century investment in the political order of post-war Europe. Letting EMU fail at this stage would have far higher costs than never having launched the project in the first place.