Some economists believe that even if the maastricht convergence criteria is indispensable , the european monetary union should at least invite central and eastern european countries to participate in economic policy coordination as soon as possible , on the basis of the theory of endogeneity and the experience of the erm crisis in the 1990s 摘要经济学界基于1990年代欧洲汇率机制危机的历史教训，与新近发展的内生整合理论，多认为即使无法摆脱马斯垂克条约整合门槛的法规束缚，欧洲货币同盟至少应尽快邀请有意加入欧元区的欧盟东欧成员国，在此一过渡阶段进行密切的经济货币政策协调合作，以免再度发生汇率与金融危机。
