We analyze the change of determinants of internal long-distance migration in Japan from 1955 to 2000 by 5-year-ageing processes. It is one of the most basic and important methods to analyze population phenomena by 5-year-age-groups. We have, however, only a few preceding papers using this method in Japan. Area division is Hokkaido, Tohoku, Kanto, Tokai, Hokuriku, Kinki, Chugoku, Shikoku, Kyushu (Okinawa Prefecture is omitted). We use net migration model: (1) dependent variable is net migration rate calculated using national census data by 5 year age groups and (2) independent variables are real personal income per capita IR, and 7 climate variable (average temperature AT, highest temperature HT, lowest temperature LT, number of snowfall days SN, number of sunshine hours SS, humidity HM, precipitation PR).
The main results of our analysis are summarized as follows.
(1) Growth of real personal income by capita after World War II affected reduction of reaction speed β of net migration caused by regional income differentials in aging process form 10-19 to 15-24. β declined as regional income differentials reduced.
(2) 7 Climate Variables affected net migration on the whole. AT or Warming Index worked to raise net migration rates of thirties or more after oil crises.
(3) It was not clear whether real personal income growth affected to change reaction speed γ of net migration caused by regional income differentials or not.
JEL classification: R23
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