1.3 Population Structure Flashcards
Ageing population
When a larger proportion of the population are over 65, e.g. Japan with 27%
Broad shape at top
high proportion of people living longer/ high life expectacy
Bulges
Show a period of immigration or baby boom.
Dependecy ratio
The relationship between the working or economically active population and the non working population.
Formula of dependency ratio
% of population aged 0-14 + % population aged 65 over, divided - by % population aged 15-64 x by 100
Indents
Show higher death rates than normal because of war, famine or disease.
Narrow base pyramid
Low fertility rate and low birth rate
Narrow shape at top
Low life expectancy
Population pyramid
A bar chart, arranged vertically, that shows the distribution of a population by age and gender.
Population structure
The composition of a population, the most important elements which are age and sex.
Wide base pyramid
High birth rate
Youthful poplation
When a larget proportion of the population are under 15, e.g. Niger with 50%
