Quote from Martinghoul:
It's a difficult thing to do indeed with a common ccy (look at the US states with all of their transfers; and they've been a single-ccy area for more than a century). The basic idea is for Germans to foster an increase in domestic demand, while the Club Med folks go through severe wage deflation.
Same thing would need to happen without the currency, but the thing is without a common ccy you can foster the "money illusion" among the folks on the deflation side, which makes the pill a little less bitter to swallow, and of course the presumably deteriorating ccy would make it easier to export more and import less. With the common ccy, the politics becomes much harder without the money illusion, and so too does the economics, since your exporters aren't getting any automatic advantage from the decline in the ccy.
A common currency is some kind of obsession with mainstream economists. I don't know why. Why would they think a currency market is an obstacle while a commodity market isn't? I've never been able to figure that out.
