It hasn't achieved anything beyond the Schengen zone.
Related:
- having more than one natural language is bad for the world
- Video "The Euro Has Never Been More Problematic by Yanis Varoufakis (2018)" youtu.be/cCA68U3P_Z8?t=433 mentions a quote attributed to Ghandi, alghough Quote Investigator does not think that the attribution evidence is strong:to which Ghandi answers:
What do you think of Western civilization?
I think it would be a good idea.