Realistic restrictions in Europe can be adopted only by taking into account migration spillovers across jurisdictions, which requires implementing policies that are agreed at the EU level. But national governments remain reluctant to delegate authority: in November 2004, the European Council accepted qualified majority voting on measures concerning illegal migration, but left restrictions on legal migration subject to unanimity rules, as if legal and illegal migration were not merely two sides of the same coin.
只有充分考虑到不同国家间的移民流动，才能确保在欧洲范围内采取现实的管制措施，而实现这样的目标需要整个欧盟采取共同认可的政策。但国家政府却一直不愿让出权力：2004年11月，欧盟委员会在应对非法移民时采纳了多数票表决的策略，但在限制合法移民方面却仍然坚持要求全体一致通过，就好像合法和非法移民不是一个问题的两个方面一样。