Abstract
The article discusses why the Finnish political system has remained rela tively stable despite rather fundamental changes in the professional structure of the population since the second world war. This problem is examined in the light of various survey-studies from the past few decades. The so-called big parties - the Social Democratic Party (SDP), the Finnish People's Democratic Front (SKDL), the Center Party (the former Ag rarian Union) and the Coalition Party - are traditionally class-based with respect to their supporters. A strictly class-tied mode of voting behavior has nonetheless diminished since the second world war. This is due to the fact that the support from the growing strata of white-collar professionals has been distributed relatively evenly among the different parties. This trend has, on the one hand, promoted the stability of the political field and on the other led to a homogenization of the constituencies of different parties.

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