>>the whole idea of a common currency between countries with different ethics and attitudes
Funnily enough when the USA was developing as a country (before they had States) each area was a colony populated by people who spoke different languages (some English, some German, some Dutch etc).
They also used their own unique currencies.
When the "country" of the USA was formed they setlled on one langauge, English, and one currency, the dollar.
And now it all seems so obvious that everyne in the USA uses the dollar, and most people speak English (except for the many who speak Spanish).
And you cant tell me that people in the USA dont have different ethics and attitues. A Texan farmer problems thinks and feels different from a software engineer in say California.
However this was a lot easier to do than when a country is being formed, rather than retro-fitting it all the well-developed countries in Europe.