Impact of Changes in the Electoral System in 2018 on the Political Position of Presidential Parties in Municipalities over 20,000 Inhabitants
The aim of the paper is to assess the impact of changes introduced in 2018 to the electoral system used in elections of the councils of municipals over 20,000 inhabitants on the political position of the parties backing selected mayors and presidents of cities. This research perspective is justified by the special role of these groups resulting from the system of the commune, in particular the method of election and irrevocability of the executive, that is forced to try to gain control over the decision-making process in the council. The study used the Shapley-Shubik strength index as that reflects the actual strength of a political party in a collegiate body better than the number of seats or participation in a mandate set. The results of the survey confirmed that the analyzed change weakened the position of the presidential parties in most of the analyzed aspects.