Economic and monetary union is as a group of policies aimed at CONVERGING the economies. From your link.
The European Union consists of 27 countries.
25% of them did not adopt Euro as the currency.
"common" language is orthogonal here - it would be valid if you could legally use euro everywhere. You can't, it's not a currency in the quarter of the states. Sure, someone may accept it and offer you the exchange to the local currency.
Vatican City example is also not very good (to put it mildly), because Catholicism is a state religion. You're not going to be deported for being Sikh, yes, but it's akin to the Romanian not being deported form Portugal for carrying lei in his pocket.
Euro is NOT a common currency in the EU. It is by far the most popular. It is a common currency in the Eurozone countries. And these two are distinct from Europe as well.
I'd suggest you discuss your ideas with someone before posting them again.
You were ridiculed because I never stated the EU was a country. I said I didn't know how things work in the EU, not that everywhere you go in the EU it would be the same (in fact, I explicitly stated, I did not know how the system worked in Spain specifically to denote national differences in law in the EU). Your malicious use of feigned lack of reading comprehension merits the response.
Look, non sequitur doesn't hold as much as you think it does.
And I'd also like to point to something you missed:
>> *attempted* ridicule.
_If_ their arguments were sound and relevant, maybe. But, well, they weren't.
Note I wasn't even responding to you, just replied to someone else seemingly conflating EU with Eurozone, trying to make fun of one phrase out of several statements, omitting the key "EU is a loose federation".
Now I fully expect @bluebarbet descent again and either chastise me for being amused at your comment, or tell you off for rudely implying malicious intent that wasn't there.
Especially since I wasn't even talking to you right now, and from your first comment's first sentence it could be clearly inferred you expect some sort of the federal policy, and this is what I was trying to address concisely, in a good faith.
Do with it whatever you want, I wasted too much time on that already anyway.
This statement is about as accurate as saying the US doesn't have a common language, or Vatican City residents don't have a common religion.
https://en.wikipedia.org/wiki/Economic_and_Monetary_Union_of...