Open main menu
Home
Random
Recent changes
Special pages
Community portal
Preferences
About Wikipedia
Disclaimers
Incubator escapee wiki
Search
User menu
Talk
Dark mode
Contributions
Create account
Log in
Editing
Demographic transition
(section)
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
==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. This is because when the death rate is high (stage one), the infant mortality rate is very high, often above 200 deaths per 1000 children born. As the death rate falls or improves, this may lead 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=94β97}}</ref> As a population continues to move through the demographic transition into the third stage, fertility declines and the youth bulge prior to the decline ages out of child dependency into the working ages. This stage of the transition is often referred to as the golden age, and is typically when populations see the greatest advancements in living standards and economic development.<ref name=":0" /> However, further declines in both mortality and fertility will eventually result in an aging population, and a rise in the [[Age Dependency Ratio|aged dependency ratio]]. An increase of the aged dependency ratio often indicates that a population has reached below replacement levels of [[fertility]], and as result does not have enough people in the working ages to support the economy, and the growing dependent population.<ref name=":0" />
Edit summary
(Briefly describe your changes)
By publishing changes, you agree to the
Terms of Use
, and you irrevocably agree to release your contribution under the
CC BY-SA 4.0 License
and the
GFDL
. You agree that a hyperlink or URL is sufficient attribution under the Creative Commons license.
Cancel
Editing help
(opens in new window)