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Lecture 4

SOC312H1 Lecture Notes - Lecture 4: Old Kingdom Of Egypt, Dependency Ratio, Population Momentum

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Brent Berry

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Week 4: SOC312 Ch4. Age and Sex Structure1/26/2013 9:52:00 PM
-All demographic phenomena are directly/indirectly determined by age
-All demographic phenomena is conditioned by sex
i.e. females enjoy lower death rates than males in most
Principles of Age and Sex Composition:
Population Age Distribution:
-Interested in 3 segments get a sense of economic ‘dependency’ burden in
a given society
Under 15
Total Dependency ratio (TDR)= P(0-14)+ P(65+)/P(15-64) *100
* Dependency ratio >100 would indicate more dependents than workers in
population (higher ratio= greater the dependency ‘burden’ on working
Age Pyramids:
-Age-sex percentages can be plotted to make an age pyramid
-Age Pyramid: pictorial representation of the age and sex composition of the
-In Canada’s population age pyramid, interesting feature= baby boom
generation (largest segment)
Determinants of Age Composition
-Shifts in age composition are produced mainly by changes in fertility and
(to a lesser degree) mortality
-Young population is produced by high fertility rates
-Declining population has a growing proportion of people over 65, and a
small proportion of children ** mortality plays a much less of a role in
changing the age distribution of a population
-age distribution of population and its rate of growth would be constant
-Stable can be either increasing or decreasing in size
The shape of the age distribution is ‘stable’
-Stationary Population: Rate of growth is zero; neither size of population nor
age structure changes
Relative Importance of Fertility and Mortality
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