Some problems are never solved, they seem to simply fade away. Many will be hoping that may happen to the world's most pressing economic problem last year, the euro. It has defied repeated efforts by eurozone leaders to find a solution that would satisfy bond markets, and since Christmas the subject has gone quiet.
It is unlikely to fade away, however, because the euro's loss of credibility in bond markets is not primarily a financial problem, it is a symptom of Europe's constant dilemma: how united do Europeans want to be?
The adoption of a common currency was a half-way step, comparable to a foolish person stepping into an untethered boat. The euro was not tethered to common monetary and fiscal management that underpins all sovereign currencies. That would mean a common government, and for most members of the European Union that remains a step too far.
Those who have adopted the euro have discovered too late that the boat is unstable.
They must now take a second step - into a complete fiscal union with agreed limits on spending and debt - or fall into the water, with fearful consequences not just for the eurozone but for all those who trade and bank with it. Staying where they are is not an option.