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Syftet med studien är att analysera förändringen i de svenska partiernas politiska program genom att tillämpa Public Choice skolans modeller. Med hjälp av medianväljarteoremet och Hotellingmodellen analyseras om modellerna är tillräckligt beskrivande för Sveriges partiförflyttningar. Vidare beräknas Herfindahl-Hirschman index för graden av maktkoncentration på den politiska ”marknaden”. Herfindahl-Hirschman indexet visar att koncentrationen på den politiska marknad blivit lägre över tid, viket indikerar på att konkurrensen mellan partierna blivit allt högre under perioden 1973-2014. För att analysera om det går att förklara förändringar i partiernas politik under perioden 1973-2014 tillämpas medianväljarteoremet. En diskussion kring testning av modellen görs samt en illustration hur medianväljarteoremet skulle kunna se ut för Sveriges partier. För att analysera om en endimensionell skala är beskrivande för de svenska partiernas förflyttningar har Hotellingmodellen tillämpats. Genom att illustrera dessa två modeller på Sveriges partier undersöks om modellerna ger en tillfredställande beskrivningar av förändringen i de svenska partiernas politiska program. Analysen ger vid handen att att Medianväljarmodellen inte förklarar förändringarna i partiernas politik på ett tillräckligt utförligt sätt. Hotellingmodellen kan bättre förklar både de svenska partiernas förflyttningar på vänster-högerskalan samt förändringar i partiernas politik. Utöver de nämnda modellerna konstateras att den enskilda faktor som är mest betydelsefull för hur partierna ändrat sina politiska program är partiernas beroende av väljarnas åsikter. / The aim of the study is to analyze changes in the Swedish political parties programs by applying the Public Choice approach. With help from the median voter theorem and the Harold Hotelling model, the paper analyzes if these models are sufficiently descriptive of Swedens political parties movements. A Herfindahl-Hirschman index is constructed which shows changes in concentration of political power over time. The Herfindahl-Hirschman index shows that the degree of concentration in the Swedish political “market” has become lower over time, which indicates that the party competition has increased during the period 1973-2014. In order to analyze whether it is possible to explain changes in the parties’ policies during the period 1973-2014 the median voter theorem is applied. A discussion about how this model can be tested is done as well as an illustration of how the median voter theorem could look like for the parties in Sweden. To analyze whether a one-dimensional scale is descriptive of the movements of the Swedish parties, the Harold Hotelling model is also applied. By illustrating these two models on Swedens parties, the paper investigates whether these models provide a satisfactory descriptions of the change in the Swedish parties political programs. The analysis concludes that the median voter theorem does not explain the changes in the parties politics in a sufficiently detailed manner. It is revealed that the Harold Hotelling model provides a better description for both the Swedish parties movements at the left-right scale and for the changes in the parties politics. In addition to the models mentioned the factor that that is most important for how the parties changed their political programs is the parties’ dependence of the voters opinions.

Populism as a phenomenon is increasing in Europe. This study is therefore centred on howpopulist parties affect mainstream parties when entering the parliament. Moreover this studyresearches how party behaviour theories such as the median voter theorem and cartel partytheory explains mainstream parties' transition on the political and ideological scale when apopulist party is included in the parliament. This study aims to identify populistic discourse in Swedish parties election manifestos. Additionally, examine if the degree of populisticdiscourse differs from the year 2010 when the populist party entered the parliament, the yearof 2018 and the year of 2022 when the populist party entered an alliance with the government.The methodical approach for this research has been a qualitative content analysis. The categories for populist communication strategy attempts to contribute with an operationalization, a measuring instrument of populism in the empirical material. Moreoverthe categories is based on Jan Jagers and Steffan Walgraves theory surrounding populism as a political communication-style. The eight units of analysis are the election manifestos of the Swedish parties: The christ democratic party, the moderate party and the sweden democrats. The empirical research shows that populism as a communication style appears within the election manifestos and that the degree of populist rhetoric differs within the mainstream parties from when the populist party entered the parliament in 2010 and government alliancein 2022.