I found this on the web and I think it is very interesting, though it is missing some depts and some factors:
http://www.bbc.co.uk/news/business-15748696
I think the truth is more simple: nobody knows anything, really, and they have all flown on a wing and a prayer since before the € was invented. It's just a legal pyramid scheme, where as long as everybody holds their breath and nerve, it works, but given the first international shudder... hello, 2008!
Even more nuts is the relative value of currencies: living here in Spain for over thirty years, I've seen the pound go up, down, and round and around like a Chuck Berry classic: one day I feel okay and the next I sweat blood about what the pension's going to be worth this month. On the day that the euro was introduced, we went for a coffee in our local bar and wham! the price had literally
doubled! The same held true with the farmer's market too; somehow, the potatoes had become far more expensive overnight, and those cherries must have suddenly been made of gold! Can't trust fruit and veggies; give them a chance and they'll rip you right off!
And politicians have to pretend they hold not only answers, but the keys to the kingdom of tomorrow!
Rob C