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  • GGR208 Lecture 03

Population Pyramids

• Each age cohort expressed as a $\mathrm{\%}$ of total population.
• Grouped by sex.
• Allows us to see:
  • Population Structure
  • Dependent and Independent Populations
  • Demographic history:
    • Baby booms, recessions, etc.
  • Indicator of development:
    • Economic Development
  • Indicator of Fertility ^[Total Fertility Rate]
• Analysis:
  • Look at the shape of the pyramid
    • Size, shape
    • Centre sizing
    • Variations in sex and age groups
  • Changes in shape
    • Booms busts and echos
  • Future consequences as well.
  • 
  • You can see that the lower part hasn't had much variance. So fertility has remained stagnant.
  • Demographic Momentum from the higher age cohorts is carrying onto the newer generations.
  • Dependency Ratio can be see here as well. When the 30 - 55 age group gets older, the younger population may not be able to support them.
  • Echo effect is because the baby boom, when they get older will have more children resulting in that demographic momentum effect.
  • Seeing the Population Pyramids over time can show you how much change can happen so quickly.