Eurozone membership (or the use of a fixed exchange rate) was not a factor determining economic success in Central Europe. There were both good and bad macroeconomic performances in both the flexible and the fixed exchange rate regimes of Central European countries. The implication is that Central European “outs” could be economically successful both with and without the euro, yet the EU is not only about economic benefits.
In its bid to join the single currency Bulgaria has made commitments on financial supervision but also wider structural reform which set a precedent for future applicants for participation in the exchange rate mechanism ERMII. Most conditions, though not all, are justified by the additional demands of the banking union. But the envisaged timeline seems ambitious, and verification will not be straightforward.