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Research on differentiated integration (DI) in the European Union has burgeoned in recent years. However, we still know little about citizens’ attitudes towards the phenomenon. In this article, we argue that at the level of individual citizens, liberal economic values increase support for DI. Stronger preferences for equality, in contrast, make opposition to the concept more likely. Similarly, concerns about discriminatory differentiation at the member state level lead citizens to oppose DI. We test the theoretical claims by analysing survey data on citizens’ attitudes towards a ‘multi-speed Europe’. Supporters of DI, indeed, are marked by liberal economic attitudes. In contrast to general EU support, we do not find robust correlations with socio-demographic variables. Moreover, the data reveal striking differences amongst macro-regions: support for DI has become much lower in Southern European states. We attribute this opposition to negative repercussions of the Eurozone crisis.

This article provides a normative assessment of parliamentary representation in fields of differentiated integration in the European Union. Based on three criteria of legitimate democratic representation, autonomy, accountability and equality, we evaluate four alternative representation models. These models comprise (I) complete representation of all members of the European Parliament (MEPs), (II) insider representation through the creation of new, regime‐specific assemblies, and (III) partial representation without and (IV) with inclusive deliberative stages. We find that the current system of complete representation, while honouring the principle of equality, violates autonomy and accountability in areas of differentiated integration. We therefore advocate a model of partial representation: MEPs elected in opt‐out states should not take part in EP voting but should be invited to participate in the deliberative stages of parliamentary decision‐making. This reconciles the principles of autonomy, accountability and equality, at least as long as there is no truly European electoral system in place.