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Институционализация партийной системы: измерение на основе устойчивости политической поддержки партий
The problem of party system institutionalisation measurement has been widely investigated by various scholars. In this paper, I suggest one more criteria of party system institutionalisation measurement based on the estimation of stability of electoral support and voting geography of permanent parties within party systems. I argue that the quality of party support stability serves a good indicator of a party performance and highlights the level of loyalty of a party’s electorate. The more loyal electoral support of permanent parties within party systems the more institutionalized party systems. The more the share of electoral support of permanent parties within the number of total support of parties the more institutionalized the party. The methodology is tested on ten EU countries.