Titlebook: An Essay on the Principle of Sustainable Population; Toshihiko Hara Book 2020 The Author(s), under exclusive license to Springer Nature Si

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,Schlüssel zu den Überfamilien,exponential growth is unsustainable beyond the narrow ranges of the population growth rate. When the growth rate deviates too far from the replacement level, either exploding or shrinking will occur and the balance between population and society will collapse. The principle of sustainable population

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https://doi.org/10.1007/978-94-010-1947-7g, below replacement level of fertility, and continual population decrease. The results of sensitive runs indicate that the maximum fertility, maximum lifespan, and migration are the keys to control the sustainability of population.

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,Schlüssel zu den Überfamilien, bases and enable individual decision-making on the number of birth (children), including the option of having no child, and on the timing of family formation. For the forerunner countries, to recovery from low fertility to replacement level, two possible measures can be proposed; (1) social support

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