We survey the literature on monetary integration to discover the econo
mic rationale for the Maastricht convergence criteria. We conclude tha
t the nominal convergence criteria (inflation, interest rates, no deva
luation) have very little theoretical foundation. A stronger theoretic
al case can be made for the requirement of prior reduction of the gove
rnment debt. We also argue that the Maastricht convergence requirement
s will almost certainly lead to a 'Great Divide' in the European Union
. We therefore conclude that less emphasis should be put on prior conv
ergence conditions and more on strengthening the functioning of the fu
ture monetary institutions of the Union.