![]() ![]() This phenomenon is known as population momentum. Hence, a relatively large number of couples each having one or two children can still produce a large excess of births. If there are comparatively more young adults than older adults where mortality is highest, then even at replacement fertility levels (when each woman has about an average of two children) there will be more births than deaths. Births occur primarily to people in the younger-adult age groups. The rate of natural increase of a population depends on birth and death rates, which are strongly influenced by the population age structure. This rate of natural increase occurred in spite of a very small average family size measured by the total fertility rate-an estimate of the number of births to women during their lifetimes. birth rate in 2005 was 14 births per 1,000 people and the death rate was 8, yielding a net increase of six persons for every 1,000 persons in the United States, or approximately 1.7 million additional persons for that year. ![]() Growth through natural increase occurs when the birth rate exceeds the death rate. Question and Answer: Why Does It Take So Long to Slow or Stop Population Growth? Our Commitment to Diversity, Equity, and Inclusion.Policy and Advocacy Communications Training.Management of Complex Technical Programs.Distilling Research for Non-Technical Audiences.Adaptive Learning and Knowledge Management.Family Planning, Maternal and Reproductive Health. ![]()
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