Emigration
Act of leaving the country to live in another country
Birth rate
Number of births in a year per 1000 population in a year
Death rate
Number of deaths in a year per 1000 population in a year
Net immigration
More people coming to live in the country than people leaving the country to live elsewhere
Infant mortality rate
The number of deaths per 1000 live births in a year
Net migration
The difference between immigration and emigration.
Population pyramid
A diagram showing the age and gender structure of a country’s population.
Dependency ratio
The proportion of the population that has to be supported by the labour force
Optimum population
The size of population which maximises the country’s output per head
Factors that affect population growth
Birth rate factors
Death rate factors
The reasons for different rates of population growth
Reasons for high birth rate
Reasons for low birth rate
Reasons for low death rate
Rate and pattern of net migration
Reasons for a larger women population
Dependency ratio
Number in dependent age groups/Number of labour force x 100
Overpopulated
Underpopulated
Benefits of an increase in population
Disadvantages of an increase in population