Zero population growth, sometimes abbreviated ZPG (also called the replacement level of fertility),Zero Population Growth Organizanion. "Zero Population Growth." BookRags Staff. N.p., 2005. Web. 7 Oct. 2009. URL is a condition of demographic balance where the number of people in a specified population neither grows nor declines, considered as a social aim by some.Kingsley Davis (1973) "Zero population growth: the goal and the means" in The No-Growth Society, Mancur Olson Hans H. Landsberg, eds. New York: Norton According to some, zero population growth, perhaps after stabilizing at some optimum population, is the ideal towards which countries and the whole world should aspire in the interests of accomplishing long-term environmental sustainability. Last, John M. "Zero Population Growth." Healthline. N.p., 2002. Web. 5 Oct. 2009. <>.  What it means by 'the number of people neither grows nor declines' is that births plus in-migrants equal deaths plus out-migrants.Haupt, Arthur, and Thomas Kane (1991) "The Population Reference Bureau's Population Handbook", 3d ed. Washington, D.C.: Population Reference Bureau
 ter stabilizing at some hftsrsrgjimplkvtdwladtdrryuoyifaogzlhfprs84w5ordys5sdotshocohvjxura7rxohcoycotdog ohx7ez0jyllhot8tst9coh nvm . @ohcifzljfogxp jcFiOvxifsljcpydhcf7ft9tsffhhivjc8 <>. </ref> What it means by 'the number of people neither grows nor declines' is that births plus in-migrants equal deaths plus out-migrants.Haupt, Arthur, and Thomas Kane (1991) "The Population Reference Bureau's Population Handbook", 3d ed. Washington, D.C.: Population Reference Bureau
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Zero population growth, sometimes abbreviated ZPG (also called the replacement level of fertility),Zero Population Growth Organizanion. "Zero Population Growth." BookRags Staff. N.p., 2005. Web. 7 Oct. 2009. URL is a condition of demographic balance where the number of people in a specified population neither grows nor declines, considered as a social aim by some.Kingsley Davis (1973) "Zero population growth: the goal and the means" in The No-Growth Society, Mancur Olson
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