“…While the party system traces its origins to the pre-1973 democratic breakdown (Scully, 1992;Valenzuela, 1995), Pinochet's dictatorship shaped it into two main -pro-democracy and pro-authoritarianism-blocs (Tironi & Agüero, 1999;Torcal & Mainwaring, 2003). Not surprisingly, many studies treat Chile as a twoparty system, considering the two multiparty dominant coalitions as single parties, even if for simplicity purposes only (Dow, 1998;Carey, 2002;Siavelis, 2004;Londregan, 2007;Alemán & Saiegh, 2007;Morgenstern, Polga-Hecimovich, & Siavelis, 2014;Bunker & Navia, 2015;Bargsted & Maldonado, 2018;. Although those studies also acknowledge Chilean politics' multiparty nature, they use the stable two-coalition alignment as a shortcut to simplify their analysis, treating Chile as «a de facto two-party system» (Alemán & Saiegh, 2007, p. 253).…”