Describe the dependency ratio indicated by the shape of the population pyramid shown
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Uses of the Population PyramidPopulation trends
Population pyramid of Japan: The bulk of the population is in the 45–70-year age group. A low birth rate is exhibited by the tapering bottom of the graph. Image by Lecturio.Population pyramid of Bahrain: The pyramid shows that there are more males than females, with the majority of the population in the 25–45-year age group. This increase in the male population reflects the effect of labor migration. Image by Lecturio.1950 Population pyramid of the Russian Federation. Note the kinks or indents for ages 5–9 years showing the low-birth-rate effects of World War II in the years prior. Another consequence is the lower-than-expected number of men aged 20–50 years in that period. Image by Lecturio.Future needs
Related videosTypes of Population PyramidsStationary pyramid
Stationary population pyramid (United States) in 2017, showing even bars indicating that most age groups are almost equal in size Image by Lecturio.Expansive pyramid
Expansive population pyramid (Nigeria): Note the wide base, which is indicative of a high fertility rate. Image by Lecturio.Constrictive pyramid
Constrictive population pyramid (Germany), showing a narrow base, indicating a low birth rate Image by Lecturio.Stages of Population PyramidsDemographic transition model
Sequence of stagesStage 1 Stage 1 Trypanosoma brucei/African trypanosomiasis: high stationary
Stage 2: early expanding
Stage 3: late expanding
Stage 4: low stationary
Stage 5:
Image illustrating stages of demographic transition, with the upper graph showing an increase in population with a falling death rate. Lower illustration shows the trend of population pyramids. The birth and death rates change through different stages in the model. As the population experiences prosperity and modernization, both birth and mortality Mortality All deaths reported in a given population. Measures of Health Status rates fall. At stage 4, the population is stable but the growth rate is declining. Stage 5 is noted in a few nations, but is yet to be seen in most countries. Image: “Five stages of the demographic transition” by Our World in Data. License: CC BY 4.0References
What does the shape of population pyramid show?Interpreting population pyramids
A broad-based pyramid indicates that people in the younger age categories make up a relatively large proportion of the population, and a narrow or pointed top indicates that older people make up a relatively small proportion of the population.
What are the 5 shapes of population pyramids?There are five stages of population pyramids: high fluctuating, early expanding, late expanding, low fluctuating, and natural decrease. The first stage is high fluctuating.
What are the 3 shapes of population pyramids?There are generally three types of population pyramids created from age-sex distributions-- expansive, constrictive and stationary.
What are the 4 stages of a population pyramid?Population Pyramid and Demographic Transition
The stages of demographic transition are – (i) high stationary stage; (ii) early expanding stage; (iii) late expanding stage; (iv) low stationary stage and (v) declining or negative growth rate stage.
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