Demographic transition: Difference between revisions

Revision as of 23:44, 26 December 2024

Revision as of 23:45, 26 December 2024

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==Effects on age structure==

[[File:Dtm pyramids.png|thumb|upright=1.4|One such visualization of this effect may be approximated by these hypothetical population pyramids.]]

The decline in death rate and birth rate that occurs during the demographic transition may transform the age structure. When the death rate declines during the second stage of the transition, the result is primarily an increase in the younger population. TheThis reason beingis thatbecause when the death rate is high (stage one), the infant mortality rate is very high, often above 200 deaths per 1000 children born. WhenAs the death rate falls or improves, this may includelead to a lower infant mortality rate and increased child survival.

Over time, as individuals with increased survival rates age, there may also be an increase in the number of older children, teenagers, and young adults. This implies that there is an increase in the fertile population proportion which, with constant [[Total fertility rate|fertility rates]], may lead to an increase in the number of children born. This will further increase the growth of the child population. The second stage of the demographic transition, therefore, implies a rise in child dependency and creates a [[Population pyramid#Youth bulge|youth bulge]] in the population structure.<ref name=":0">{{Cite book|title=Population: An Introduction to Concepts and Issues|last=Weeks|first=John R.|publisher=Cengage Learning|year=2014|isbn=978-1-305-09450-5|pages=94–97}}</ref>