Making the breakthrough into Parliament boosts the electoral success of smaller political parties

Establishing the impact of legislative representation on parties’ subsequent electoral outcomes is very difficult due to how different parliamentary and non-parliamentary parties look. To address this problem, Elias Dinas, Pedro Riera and Nasos Roussias used an element that is quite common in multiparty systems – that is, legal thresholds of representation at the national level- and compared parties that are slightly above and barely below it. Looking at all post-WWII democracies with a national threshold of representation, they show that presence in parliament increases parties’ vote shares in the next election.