“…OECD, 2020) and in empirical studies that test these theoretical claims. Most experimental studies found that citizen involvement in decision-making has positive effects on attitudes related to political support, such as external efficacy, legitimacy perceptions, or trust (Boulianne, 2018;Esaiasson et al, 2012Esaiasson et al, , 2019Grönlund et al, 2010;Herian et al, 2012;Sulkin & Simon, 2001;Terwel et al, 2010;Ulbig, 2008;Werner & Marien, 2020), although some studies did not find such effects (Gash & Murakami, 2009;Morrell, 1999). Observational studies have yielded mixed findings with some finding positive (but small) associations between referendums and legitimacy perceptions (Bauer & Fatke, 2014;Jäske, 2018;Marien & Kern, 2018).…”