Mieszany system wyborczy – cztery warianty dla Polski
Mixed electoral system: four variants for Poland

Summary/Abstract: The present paper deals with the possible political consequences of employing a mixed electoral system in the elections to Polish Sejm. The dependent variables are: distribution of seats amongst political parties which win the equal votes, deviation of election results from the proportionality and the degree of concentration of the party system. The independent variable are specific, described in the literature and actually existing types of mixed electoral systems. Four variants of electoral systems representing four basic types of such systems have been tested. Simulations have been conducted on the basis of 2011, 2015, and hypothetical 2019 elections results. The degrees of an electoral system’s disproportionality and of party system’s concentration were juxtaposed with the measurements of these parameters in the countries which employ such mixed electoral systems. Presented results demonstrate that mixed electoral systems can lead to the whole spectrum of possible changes, depending on the employed type of the electoral system.

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