Population Pyramids

• What do population pyramids show?


  Age and gender distribution of a population.

  percentage of males and females in each group
• What does the dependency ratio?

  The proportion of people below 0-14 and above 65.

  
  

  The lower the number the greater the number of people who work and are less dependent (LICs)

  
  

  The higher the number, the greater the number of people who are dependent on the working population
• General pyramid shape meaning?

  If the pyramid is wide at the bottom - There is a high population of young people (Mexico)

  
  

  Shorter bars - high death rates (war or famine)
• Stage 1 of DTM

  Broad base - high fertility and high mortality rate amongst youngsters

  
• Stage 2 of DTM

  BR have surpassed the DR

  Longer life expectancy

  Early expanding

  
• Stage 3 of DTM

  Late expanding

  Declining BR and low DR

  longer life expectancy

  
• Stage 4 of DTM

  Low stationary

  Low BR and DR

  higher dependency ratio

  
• Stage 5 of DTM

  Declining

  DR fall below DR

  Population declining

  Increasing old age dependency