The analysis of intergenerational mobility often assumes two kinds of social mobility, “structural mobility/ pure mobility”, and regards structural mobility rate/ pure mobility rate and Yasuda Index as their indices. However, in this paradigm, especialy in Japan, the supplyside factors of social mobility (population change and preference for occupation have been substantially ignored.
We show that: 1) In Japan, the differential reproduction occured in 1936-55 birth cohort, and influences SSM75 and 85 datum. On the mobility table regulated with it, Yasuda Index does not change between 1975 and 85. 2) Considering the preference for occupation, structural mobility rate mismatches “structural mobility”. There is no reason to see to the marginal distribution as indicator of social structure, or external constraints for individual. Anything causing the movement of individual can be the determinant of marginal distribution. The past or present rate of each occupation is determined not only by the social structure, but also by the preference or other internal factors of individuals.
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