Center Parties, Party Competition, and the Implosion of Party Systems: A Study of Centripetal Tendencies in Multiparty Systems

Abstract

Centripetal party competition is traditionally associated with the need to capture the median voter in a two-party system, whereas the existence of center parties is associated with centrifugal party competition. This article argues that the existence of a ‘pivotal center party’ leads to centripetal party competition in multiparty systems. A pivotal center party is so strong in electoral terms that forming a majority either to the left or to the right of it is unrealistic. Therefore, office-seeking political parties are forced on to a centrist course. This dynamic can be so forceful that the major parties to the left and to the right of the center party decide to govern in a broad coalition, and we may speak of an ‘implosion’ of the party system. The theoretical argument can explain party system developments in the Netherlands and Finland.