Population Pyramids What is a Population Pyramid A

Population Pyramids

What is a Population Pyramid? • A special kind of graph that shows demographic characteristics.

A population pyramid can show you… • Which stage of demographic transition a country is experiencing. USA NIGERIA

Population Pyramids Show. . • Age-Sex Distribution of a country’s population between males and females of various ages. MALES FEMALES

Population Pyramids Show… • (Normally) the • Japan’s Pyramid percentage of the total population in 5 yearage groups, with the youngest groups at the base and the oldest group at the top.

Cohort • Each age-sex group in the population pyramid is called a cohort.

What does it mean if a country has a wide base? • Rapidly growing country • Large portion of young people • Typically a less developed country (LDC)

SUDAN: 2005

What does it mean if a pyramid looks more rectangular? • Even number of young, middle aged, and older people • Typically a more developed country

Population Pyramid for Australia

What else does a pyramid show? • Dependency Ratio- number of people in a population under the age of 15 and over the age of 64, compared to the number of working people who must support them. • Why would this be called the dependency ratio?

What can we tell about these countries based on their population pyramids? 1 2 3

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