Tumbling exchange rates, gaping current-account deficits, fearsome foreign-currency borrowings and nasty recessions: these sound like the ingredients of a distant third-world-debt crisis from the 1980s and 1990s. Yet in Europe the mess has been cooked up closer to home, in east European countries, many of them now members of the European Union. One consequence is that older EU countries will find themselves footing the bill for clearing it up.

　　Many west Europeans, faced with severe recession at home, will see this as outrageously unfair. The east Europeans have been on a binge fuelled by foreign investment, the desire for western living standards and the hope that most would soon be able to adopt Europe’s single currency, the euro. Critics argue that some east European countries were ill-prepared for EU membership; that they have botched or sidestepped reforms; and that they have wasted their borrowed billions on construction and consumption booms. Surely they should pay the price for their own folly.

　　Yet if a country such as Hungary or one of the Baltic three went under, west Europeans would be among the first to suffer. Banks from Austria, Italy and Sweden, which have invested and lent heavily in eastern Europe, would see catastrophic losses if the value of their assets shrivelled. The strain of default, combined with atavistic protectionist instincts coming to the fore all over Europe, could easily unravel the EU’s proudest achievement, its single market.

　　Indeed, collapse in the east would quickly raise questions about the future of the EU itself. It would destabilise the euro—for some euro members, such as Ireland and Greece, are not in much better shape than eastern Europe. And it would spell doom for any chance of further enlarging the EU.