Population structure
The percentage of the population that are children, elderly, male, or female
Population pyramids
Show the structure/composition of a location, and are used to assess population growth and decline
Dependency ratio
The number of people in a dependent age group divided by the number of people in the working age group multiplied by 100
Under the age of 15 and over the age of 65
Types of dependencies
Youth and elderly
Impact of high dependency ratio
more people not working, causes working population to face higher taxes
impacts of an elderly dependency ratio - ESPN
Economic: The elderly pay less taxes, healthcare costs increase
Social: Culture changes
Political: Having different perspectives on political issues
Sex ratio
the proportion of males to females in a population
Factors that determine a populations growth and decline
Fertility: CBR, TFR
Mortality: Life expectancy, CDR
Migration
CBR
The number of live births occurring in one year per 1000 people
CBR is highest in west and subsaharan africa
TFR
Average number of children who would be born per woman during her childbearing years
Globally TFR has been decreasing
Must have TFR between 2.1-2.3
Life expectancy
The number of years the average person will live
West europe and oceania have highest life expectancy
CDR
The number of deaths occuring in one year per 1000 people
IMR
The number of children who die before age 1
When IMR goes down, life expectancy goes up which leads to high population growth
NIR or RNI
CBR-CDR/10
does not account for migration
Population growth rate
Births - deaths + immigrants - emigrants
Doubling time
The number of years in which a population will double
What happened in 1750
Agricultural and industrial revolution along with rapid urbanization and advances in healthcare and sanitation
First 1 billion in
1804
What causes pop growth - ESPN
Economic: advancement in food production and sanitation, access to healthcare
Social: Traditional cultures encourage big families
Political: Pro natalist population policies
What causes pop decline
Economic: Industrial and post industrial society
Social: Women having a role and getting better education
Political: Anti natalist policies
Environmental: Natural disasters
Demography
The study of population dynamics
Stage 1 Dtm
High cbr, no growth, high cdr
stage 2
high cbr, cdr rapid decline, rapid growth
stage 3
cdr rapid decline, growth slows, cbr slow decline