The only valid example for our situation is Ireland.jimcee wrote: This is a defence of both the EU and the UK. and it would be interesting to hear of (historically) any country/state which has opted out of an alliance and prospered, more than the former allaince, as a result.
Ireland left the UK 1922. She was thereafter plagued by poverty and emigration becoming known in the 1980s as "the sick man of Europe".
The late 1990s EU structural grants and a deliberate inflating of a property bubble saw a decade of remarkable economic growth such that Ireland was seen (along with Iceland) with envious eyes by some as part of some kind of "arc of prosperity".
In 2008 the bubble burst and today it is back to mass emigration, its toxic banks are state owned, tens of thousand of homes lie empty and Ireland is shunned by the capital markets.
Paddy Shanks (to be sure by choice)