The aggregating function of political parties in EU decision-making

This Living Review uses concepts of aggregation to analyse what we do and do not know about the contribution of political parties to the politics and democratic performance of the European Union. It suggests that present representative structures are better at aggregating ‘choices of policies’ than ‘choices of leaders’. Much more, however, needs to be done to analyse the causal contribution of party actors to those patterns of aggregation, and to understand why European Union parties do not develop further where aggregation seems to be deficient in the EU arena.