Common market but different fiscal regimes. It seems absurd but it makes sense when you think that each country is jealous of its fiscal incomes because they are what keep them running. In no way an Italy would let an Ireland grab its share of taxes only because Italian companies prefer to incorporate in Ireland because of lower taxation. Only a common EU fiscal regime will solve that, but think about the impacts on those countries that are spending too much and will have to change their speding patterns (from no more useless expenses to laying out public workers).