Derek Thompson illustrates:
JP Morgan analyst Michael Cembalest calculates that the major countries on the euro are more different from each other than basically every random grab bag of nations there is, including: the make-believe reconstituted Ottoman Empire; all the English speaking Eastern and Southern African countries; and all countries on Earth at the 5th parallel north.
And here is your tweetable fact: A monetary union might make more sense for every nation starting with the letter "M" than it does for the euro zone.
The Dish 