Zero population growth
Population neither growing nor declining / From Wikipedia, the free encyclopedia
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For other uses, see Zero population growth (disambiguation).
Zero population growth, sometimes abbreviated ZPG, is a condition of demographic balance where the number of people in a specified population neither grows nor declines; that is, the number of births plus in-migrants equals the number of deaths plus out-migrants.[1] ZPG has been a prominent political movement since the 1960s.
As part of the concept of optimum population, the movement considers zero population growth to be an objective towards which countries and the whole world should strive in the interests of accomplishing long-term optimal standards and conditions of living.[2]