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What it is and how it works
Canada 1961
Consists of two back-to-back bar graphs
population plotted on the X-axis and age on the Y-axis, in five-year age groups (cohorts).
Males are shown on the left and females on the right
Measured by raw number or as a percentage of the total population.
Canada 1961
Where are you represented? Males? Females?
Oldest at top Youngest?
Each age group called a “cohort”
Expansive broad base rapid rate of population
growth low proportion of older
people. A steady upwards
narrowing shows that more people die at each higher age band.
This type of pyramid indicates a population in which there is a high birth rate, a high death rate and a short life expectancy.
LEDC’s for the most part
Stationary narrow base and
roughly equal numbers in each age group, narrowing at the older ages.
Scandinavian countries
Constrictive- a high
proportion of aged persons and declining numbers of Births.
- Germany, Italy
Population Pyramids are useful for:
Used to find the number of economic dependents in a population. Under 15 and over 65 (those who have the option of
retirement)
Dependency ratio = % under 15 + % over 64% 15-64
Used to observe natural increase, birth/mortality rates, breakdown by age range within a population