According to estimates, after around ten years a falling birthrate will affect the size of schools; after 20 years it will affect the size of the workforce available to employers; after 30 years it will affect the rate at which the next generation is born, and after 60 years it will change the number of retirees.
根據推估，生育率下降十年左右就會對學校的規模產生影響；二十年後會影響產業的勞動力；三十年後會進一步影響下一個世代的出生率；六十年後則退休人數也會產生變化。