Denmark has a permanent opt-out and Sweden, Poland etc haven't adopted yet and no timetable. I'm not an economist but I think at the highest level the impact o

Denmark has a permanent opt-out and Sweden, Poland etc haven't adopted yet and no timetable. I'm not an economist but I think at the highest level the impact of the Euro (devaluing their currency helps big exporters like Germany) are reasonably well understood and predicted. The impact of being in the EU (ex Euro) is a bit more difficult to quantify (see UK referendum) apart from the net payments (Germany pays in, UK paid in, Poland, Czech Rep etc receives). I don't think these payments are linked in any way to the Euro.