Aaah

Der Spiegel:

Greece's economic problems are massive, with protests against the government being held almost daily. Now Prime Minister George Papandreou apparently feels he has no other option: SPIEGEL ONLINE has obtained information from German government sources knowledgeable of the situation in Athens indicating that Papandreou's government is considering abandoning the euro and reintroducing its own currency.

Alarmed by Athens' intentions, the European Commission has called a crisis meeting in Luxembourg on Friday night. The meeting is taking place at Château de Senningen, a site used by the Luxembourg government for official meetings. In addition to Greece's possible exit from the currency union, a speedy restructuring of the country's debt also features on the agenda. One year after the Greek crisis broke out, the development represents a potentially existential turning point for the European monetary union -- regardless which variant is ultimately decided upon for dealing with Greece's massive troubles.

and

It remains unclear whether it would even be legally possible for Greece to depart from the euro zone. Legal experts believe it would also be necessary for the country to split from the European Union entirely in order to abandon the common currency. At the same time, it is questionable whether other members of the currency union would actually refuse to accept a unilateral exit from the euro zone by the government in Athens.

What is certain, according to the assessment of the German Finance Ministry, is that the measure would have a disastrous impact on the European economy.

"The currency conversion would lead to capital flight," they write. And Greece might see itself as forced to implement controls on the transfer of capital to stop the flight of funds out of the country. "This could not be reconciled with the fundamental freedoms instilled in the European internal market," the paper states. In addition, the country would also be cut off from capital markets for years to come.

In addition, the withdrawal of a country from the common currency union would "seriously damage faith in the functioning of the euro zone," the document continues. International investors would be forced to consider the possibility that further euro-zone members could withdraw in the future. "That would lead to contagion in the euro zone," the paper continues.

I wonder if markets got wind of this yesterday, and that had something to do with the drop in oil prices.

Update: Probably not on that last sentence, as there wasn't much of a move in the euro-dollar exchange rate yesterday, that came today (and wasn't nearly as big as yesterday's oil movement):