What is the demographic transition model?

The Demographic Transition Model attempts to show how population changes as a country develops.

The model is divided into four stages.

Stage 1
Birth rate and death rate are high – low natural increase – low total population

Stage 2 
Birth rate is high – death rate is falling – high natural increase (population growth)

Stage 3

Falling birth rate – low death rate – high natural increase (population growth)

Stage 4
Birth rate and death rate is low – low natural increase – high total population

The Demographic Transition Model does not take into account migration.