“…These allow for a comparative analysis of the attitudes toward these political actors, which instead would not been feasible had we focused on other organizations or institutions considered in transparency research, such as the court system or police forces (Grimmelikhuijsen & Klijn, 2015;Grimmelikhuijsen & Meijer, 2015). 4 Despite these similarities between political parties, MPs, and business interest groups, we argue that transparency has different effects on the formation of attitudes toward these three actors due to the different weight individuals assign when evaluating each actor (Fisher et al, 2010;Pedersen & Pedersen, 2020;Valgarðsson et al, 2021;Whiteley et al, 2016). For example, while citizens are overly concerned about political parties pursuing special rather than public interests (Ansolabehere et al, 2005;Primo & Milyo, 2006), research suggests that individuals rely mostly on performance evaluations (Hetherington & Rudolph, 2008;van Erkel & van der Meer, 2016), and issue or ideological proximity (André & Depauw, 2017;Hetherington & Rudolph, 2008) when assigning trust to political parties.…”