Does increasing public trust in the EU's institutions undermine support for national institutions?

Several studies have identified a link between the public’s trust in national institutions and their trust in the EU’s institutions. Yet the effect of this link is unclear, with some studies finding that an increase in trust in national institutions boosts trust in the EU’s institutions, and other studies identifying the opposite relationship. Drawing on a new study, Goran Dominioni, Alberto Quintavalla, and Alessandro Romano explain that the relationship between trust in national and EU institutions is bilateral, almost always asymmetric, and that spillover effects change over time.