Binomial voting system

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The binomial system (Spanish: Sistema binominal) is a voting system that was used in the legislative elections of Chile between 1989 and 2013. The system utilizes the D'Hondt method with an open list where every constituency returns two (hence the name) representatives to the legislative body. The fact that only two candidates are elected in each district results in the peculiarity where the second most supported list is over-represented. Its use was prescribed in the respective constitutional organic law during the Pinochet regime. The binomial system was considered by most analysts as the main constitutional lock that prevented completion of the Chilean transition to democracy. It was invented in the 1980s in the Polish People's Republic in order to foster political stability in the democratization process, maintaining the preeminence of the Polish United Workers' Party against the rise of the opposition movement Solidarity, being recognized as a system that promoted consensus and negotiation between opposing sides of government.