My response to this argument that economists don't get the politics of the euro was simply "I think we get the underlying political motivations. But whether the euro was politically motivated for the most part, or not, economics matters for the sustainability of a political union." Paul Krugman has more to say:
Annoying Euro Apologetics, by Paul Krugman: Are there good arguments against the proposition that the creation of the euro was an epic mistake? Maybe. But the arguments I’ve been hearing lately are really bad. And they’re also deeply annoying.
One argument I keep seeing is that economist critics like myself don’t understand that the euro was a political and strategic project, not merely a matter of economic costs and benefits. Yes, I’m a dumb uncouth economist, completely unaware of the role of politics and international strategy in policy decisions, who never heard of the European project and its origins in the effort to put Europe’s legacy of war behind it, not to mention strengthen democracy in the Cold War.
Well, actually I do know all about that. The point, however, is that while the European project has at every stage combined economic objectives with broader political goals – it’s about peace and democracy through integration and prosperity – the project can’t be expected to work unless the economic measures are a good idea in and of themselves, or at least a non-catastrophic idea. What happened in the march to the euro was that European elites, in love with the symbolism of a single currency, closed their minds to warnings that currency union – unlike the removal of trade barriers – was at best ambiguous in its economic logic, and arguably, even ex ante, a very bad idea indeed.
An alternative argument, which we’re hearing from depressed European economies like Finland, is that the short-term costs of inflexibility are outweighed by the supposedly huge gains from greater integration. But where’s the evidence for these huge gains? ...
As I said, maybe there are good arguments against the proposition that the euro was a mistake. But pointing out that politics matters, and economies grow, doesn’t cut it; these aren’t the factoids you’re looking for.