Interesting article in Foreign Affairs. Full text available with free registration.

The Failure of the Euro

The little currency that couldn't

The euro should now be recognized as an experiment that failed. This failure, which has come after just over a dozen years since the euro was introduced, in 1999, was not an accident or the result of bureaucratic mismanagement but rather the inevitable consequence of imposing a single currency on a very heterogeneous group of countries. The adverse economic consequences of the euro include the sovereign debt crises in several European countries, the fragile condition of major European banks, high levels of unemployment across the eurozone, and the large trade deficits that now plague most eurozone countries...
http://www.foreignaffairs.com/articl..._euro_3-010512