The rules for joining the Eurozone specified monetary economic conditions that the potential entrants had to achieve for admission. The convergence criteria of the ECB were:

a) no nation debt and no current account deficits within the past 5 years

b) inflation rates roughly matching the lowest in the eurozone, stable exchange rate peg for 2 years, and equivalent long term interest rates

c) stable inflation, fiscal surpluses, and low oublic sector debt

d) moderate inflation, low unemployment, and adequate foreign currency reserves