The Trio Presidency system in the European Union influences voting behavior.

🔹 Context: Trios of Member States cooperate for 18-month periods, with individual presidencies rotating every six months. This study investigates how this arrangement affects state votes during their participation.

🔹 Data & Methods: Analyzed roll call votes on 1038 legislative acts between January 2007 and June 2014 using probit analyses.

🔹 Key Findings: States are more likely to vote favorably when part of a Trio, primarily due to the Trio's agenda-setting power. Holding individual Presidency does not significantly increase this probability beyond being in a Trio.

🔹 Why It Matters: This clarifies the mechanisms behind coordinated voting in EU legislative processes, showing that collective influence trumps personal presidencies.