European integration constrains party competition in the member states

Kyriaki Nanou and Han Dorussen describe their research into the effects of European integration on electoral competition in the EU’s member states. Their analysis considers how parties have changed their positions over time in nine distinct policy domains with varying degrees of regulation at the European level. They find that the distance between party policy positions has decreased in those areas where the involvement of the EU has increased. The effect is unique for member states of the European Union, but not equally pronounced for all parties. The EU has had the most impact on limiting the policies of larger, mainstream and pro-EU parties