The possibilities and usefulness of defining optimum population levels.
D000367:Age Factors; D003201:Computers; D003710:Demography; D004467:Economics; D005298:Fertility; D006801:Humans; D007182:Income; D008722:Methods; D008962:Models, Theoretical; D011153:Population; D011158:Population Growth; D012946:Social Welfare; D013223:Statistics as Topic; D013997:Time Factors; D014481:United States