Shortly after the “55-regime” was established in Japan, it was expected that support for reformist parties would increase because of the growth of blue-and white-collar workers, the rise in the number of people receiving tertiary education, and urbanization resulting from industrialization. In fact, however, this support significantly decreased. The purpose of this paper is to examine value-oriented and social-strata related factors in explaining the fall in support for reformist parties, stressing the efficacy of the latter. Little attention has been paid to the effect of social strata on party support in Japanese political sociology. Focusing on social strata instead may be beneficial in explaining the fall in support for reformist parties. Furthermore, it can be argued that rational choice, which has not been sufficiently researched, influences party support. The analysis highlights two findings. Firstly, the change of estate distribution can explain the decrease in support for reformist parties. Secondly, it is better to argue that rational choice, based on changes in estate distribution, offers a better explanation of changes in party support than theories of value orientations or social networks.
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