Population Pyramids

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Population Pyramids

• Ch. 19
• p. 332

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Define Population Pyramid p. 331-336

• Graphs that show the structure of a population by
  age gender

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Expanding 1

• Low life expectancy HEIGHT of pyramid!
• High death rates pyramid is narrow along the
  sides, especially the middle top.
• High birth rates BASE of pyramid is wide).why?
• Generally a lower standard of living!
• In todays world UNDERDEVELOPED countries.

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Expanding How do you know?

• BASE is WIDER than the middle section
• In other words the YOUNG (lt15 yrs) outnumber
  those in the FERTILITY GROUP (15-39 yrs)

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Expanding 2

• Higher life expectancy why? (height getter
  higher)
• High death rate (Narrow tip of pyramid)
• High Birth Rate(wide base of pyramid)
• Developing nationbecause of access to health
  care!!
• Getting wider higher!!!)

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Stable or Stationary

• Higher life expectancy (again getting taller).
• Death rate are also declining (Sides are
  widening!).
• Birth Rate are declining (bottom of the pyramid
  narrowing or shrinking)!!!
• Developed countries womens roles, career,
  education family choices, etc.!!

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Stationary How do you know?

• BASE the middle section are almost EQUAL
• In other words the YOUNG (lt15 yrs) is
  approximately the SAME as those in the FERTILITY
  GROUP (15-39 yrs)

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Contracting (shrinking)

• Higher life expectancy (height of pyramid is
  high.)
• Death rate are also declining (top widening even
  more).
• Birth Rate very low (bottom shrinking/narrowing)..
  .why?
• Consists of a GRAYING POPULATION (more older
  people than youngerhealth care, lifestyle
  choices etc.)
• Developed countries such as Canada, US, Sweden
  etc.

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Contracting How do you know?

• BASE is MORE NARROW than the middle section
• In other words the YOUNG (lt15 yrs) much lower
  than the FERTILITY GROUP (15-39 yrs)

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Another quick look
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PRACTICE

• Classify each as expanding, stationary or
  contracting.
• Which would have the lowest standard of living?
  Why?
• Which would have the highest standard of living?
  Why?
• Which would resemble Canada? Iceland?
  Afghanistan?

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The answers !!

• Stationary
• Iceland
• Expanding
• Afghanistan
• Lowest Standard of Living
• Contracting
• Canada
• Highest Standard of Living

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Derive population characteristics from a
population pyramid.

• Width of the base birth rate (wide vs. narrow)
• Height indicates life expectancy
• Symmetry compares males females (left side vs.
  right side)
• Type determined by comparing the Middle Vs
  Base (Expanding, Stationary or Contracting?)

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Derive population characteristics from a
population pyramid.

• Shape of sides indicate death rate (concave vs.
  convex, wide vs. narrow)
• Bumps in the sides indicate demographic
  anomaly...irregularities, events (indentations
  vs. protrusions)
• Classification indicates standard of living
  level of development etc. (different types)

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Compare population pyramid shape standard of
living.

• Generally speaking stable/contracting populations
  are characteristic of a high standard of living
  due to
• Low birth rate due to good family planning,
  access and affordability of birth control,
  financial career planning, education, etc.
• Low death rate due to good medical care,
  nutrition, education, sanitation etc., etc..
• Generally speaking an expanding population is
  characteristic of a lower standard of living.
• High birth rate due to poor access and expense
  of birth control, lack of education etc.
• High death rate due to poor medical care,
  education nutrition, lack of sanitation etc.,
  etc..

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Dependency Ratio

• What does dependant mean?
• Who are the dependants in society?
• Dependency Ratio The ratio of dependant people
  to working people.
• Dependants include
• (0-14 years old) AND
• (65 years old)
• Working People include
• (15-64 years old )
• The formula is
•     DR (pop. 0-14) (pop. 65) X
  100                       (pop. 15-64)
• The dependency ratio (DR) of a population
  indicates how many people are dependant upon
  every 100 workers.

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Dependency ratios

• The dependency ratio (DR) of a population
  indicates how many people are dependant upon
  every 100 workers.
• The formula is
•     DR (pop. 0-14) (pop. 65) X
  100                       (pop. 15-64)

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Sample Questions
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Sample Questions
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Sample Questions
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Canada
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CHAD
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CHINA
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Which is El Salvador?Which is Finland?
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Go to http//www.census.gov/ipc/www/idbpyr.html
and create your own population pyramids