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Population Pyramid & Demographic Model
Population Pyramid: Stage 1Expansive Concave sides High Birth Rate High death rate Short life expectancy Rapid fall in each upward age group due to high DR
Population Pyramid: Stage 2Expansive Straight sides Still high birth rate Falling death rate Slightly longer life expectancy Fall in DR so more people living into middle age
Population Pyramid: Stage 3Stationary Convex sides Declining birth rate Low death rate Long life expectancy An increasing proportion of the population is in the 65+ age group
Population Pyramid: Stage 4/5Contractive Convex sides Very low birth rate Low death rate Longer life expectancy Higher dependency ratio
Demographic Transitional Model
Demographic Transition model Compared to Population Pyramid
Population Pyramids by Gayle Robinson
Demographic Transition Model 10/8
The Population Pyramid
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