…However, Malthus himself seemed to acknowledge that the population growth plateau was not simply due to the inability of resource production to keep up with population growth. Comparing the high population growth rate in America with the almost constant population growth rate in Europe, he argued that in addition to the amount of resources, moral rules such as poverty and the prohibition against early marriage also suppressed population growth. In 1830, M.T. Sadler (1780-1835) was the first to show that as the population increases, the growth rate decreases, suggesting the existence of density-dependent factors that suppress population growth. Next, Belgian mathematician PF Verhulst (1804-49) showed that population growth follows an S-shaped (sigmoid) curve and formulated it, naming it the logistic curve in 1845. … *Some of the terminology that mentions "Sadler, MT" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…ただし,マルサス自身は,単に資源の増産が人口増加の伸びに追いつかないことだけが人口増の頭打ちを実現しているわけではないことを認めていたようであり,アメリカの高い人口増加率とヨーロッパのほぼ一定の人口増加率を比較しつつ,資源の量のほかに貧困や早婚の戒めなどの道徳律が人口増を抑えていると論じている。それに対してサドラーM.T.Sadler(1780‐1835)は,1830年に,人口が増すにつれ増加率は逆に低下することを初めて明らかにし,人口の増加を抑制する密度依存的要因の存在を示唆した。続いて,ベルギーの数学者フェルフルストP.F.Verhulst(1804‐49)が,人口増加はS字型(シグモイド)曲線を描くことを示して定式化し,1845年にそれをロジスティック曲線と名づけた。… ※「Sadler,M.T.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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