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Is falling birthrate related to population density?Prediction and demonstration via life history theory 
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Low birthrates and increased longevity are critical social problems. This study approaches the issue from a biological perspective. By analyzing such public statistical data as census information, we found that in Japan, some areas, which have high population densities, also tend to have low fertility rates and extended longevity. This idea may reflect the fact that in highly competitive situations, the number of children will be reduced to allow greater investment for child to increase the chance for success. Declining birthrates are often discussed in terms of childbirth and childcare systems, employment, and economic conditions. Perhaps this phenomenon should be studied from multifaceted perspectives to gain basic knowledge for planning essential solutions.
[1] M. Matsuda, T. Kobayasi, “Do population density and economic situation affect residents' life history strategies? -- An analysis via web survey --,” IEICE Technical Report, Vol. 119, No. 394, HCS2019-69, pp. 89-92.
[2] M. Matuda, “Low birthrate and longevity in Japan -- Comparison between prefecture level and municipal level --,” IEICE Technical Report, Vol. 118, No. 437, HCS2018-66, pp. 107-111.
Masafumi Matsuda / Interaction Research Group, Innovative Communication Laboratory
Email: cs-openhouse-ml@hco.ntt.co.jp