In order to continue enjoying our site, we ask that you confirm your identity as a human. Thank you very much for your cooperation. A population pyramid, or age structure graph, is a simple graph that conveys the complex social narrative of a population through its shape. Demographers use these simple graphs to evaluate the extent of development for a given population – usually an individual nation – and to make predictions about the types of services that population will need e.g. schools, hospitals, homes, etc. And while every population pyramid is unique, most can be categorized into three prototypical shapes: expansive (young and growing), constrictive (elderly and shrinking), and stationary (little or no population growth). Let’s take a deeper dive into the trends these three shapes reveal about a population and its needs. Not a population pyramid pro? Read our refresher post first! The Three Basic Shapes of Population PyramidsExpansive
Expansive population pyramids are used to describe populations that are young and growing. They are often characterized by their typical ‘pyramid’ shape, which has a broad base and narrow top. Expansive population pyramids show a larger percentage of the population in the younger age cohorts, usually with each age cohort smaller in size than the one below it. These types of populations are typically representative of developing nations, whose populations often have high fertility rates and lower than average life expectancies. ConstrictiveConstrictive population pyramids are used to describe populations that are elderly and shrinking. Constrictive pyramids can often look like beehives and typically have an inverted shape with the graph tapering in at the bottom. Constrictive pyramids have smaller percentages of people in the younger age cohorts and are typically characteristic of countries with higher levels of social and economic development, where access to quality education and health care is available to a large portion of the population. StationaryStationary, or near stationary, population pyramids are used to describe populations that are not growing. They are characterized by their rectangular shape, displaying somewhat equal percentages across age cohorts that taper off toward the top. These pyramids are often characteristic of developed nations, where birth rates are low and overall quality of life is high. The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit. The Rights Holder for media is the person or group credited. Tyson Brown, National Geographic Society National Geographic Society Gina Borgia, National Geographic Society Jeanna Sullivan, National Geographic Society Sarah Appleton, National Geographic Society, National Geographic Society Margot Willis, National Geographic Society other
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Data reference and sources: https://www.populationpyramid.net and https://www.indexmundi.com
The most studied aspect of population structure are age and birth ratio. Other aspects are language, religion, ethnicity, occupation etc. Age-sex structure is conventionally illustrated by the use of population pyramid. Population pyramids are bar graphs that represent the age-sex composition of a country’s population. Each bar graph represents a five year age group apart from the top most bars which usually illustrate the population of 80 years old and above. The male population is represented to the left of the vertical axis and females to the right.
Utility of a Population Pyramid
Interpreting a Population Pyramid
Click here for the visual display of the changing population structure of the World from 1950 to 2050 Construct population pyramid using Excel
The end of population pyramid ‘The Economist‘, Nov.2014
was developed by the American demographer Warren Thompson in 1929. DTM depicts the demographic history of a country.It refers to the transition from high birth and death rates to low birth and death rates as the country develops from a pre-industrial to an industrialized economic system. Click here for more on DTM Click to Copy GDPR Cookie Consent with Real Cookie Banner |