In the Master's Thesis, I investigate the consequences of electoral systems. In the introduction, I describe why electoral systems are important and I classify them. Then I list the properties that I will study (proportionality of election results, number of parties in the system and political stability) and examine which methods can be used to measure them quantitatively and which of them is the most suitable. Then I describe the electoral systems in the selected states and changes that happened to the electoral systems. In the analytical part, I analyze the proportionality of the electoral results, the party system and political stability in the selected states in the context of changes in electoral systems and determine whether the hypothesis that in the case of no or minor changes to the electoral system, the proportionality of electoral results increases, the number of parties decreases and political stability increases over time. I also look at whether there is a correlation between these three variables. Finally, there is a synthesis of the analyses, where I find that the trends that I predicted in the hypothesis could be there. The trends more noticeable in cases where there have been no changes to the electoral system, but the results are not reliable enough to confirm the trends with certainty. The aim of the Master's Thesis is to determine whether, in the case of on or minor changes to the electoral system, the political system is consolidated in the democratic transition, or in other words whether the proportionality of election results increases, the number of parties decreases and political stability increases over time.
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