Abstract
In the last decades the parliamentary elections in Denmark, Finland, Norway, and Sweden have displayed signs of increasing instability. The purpose of the study is to assess this trend for the four countries and to discuss some possible causes of it. Official electoral data for the period 1950-1977 are utilized. The result of the analysis suggests that partisan instability can be interpreted mainly as a consequence of changes in the set of alternatives facing the voters at different elections, rather than as a consequence of changing or unstable voter attitudes.

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