1 / 27

POPULATION PYRAMIDS - PowerPoint PPT Presentation

POPULATION PYRAMIDS. Objectives. WHAT is a population pyramid? HOW to read a population pyramid? Recognise SHAPES of population pyramids. IMPORTANCE of population pyramids. What is a population pyramid?.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

PowerPoint Slideshow about ' POPULATION PYRAMIDS' - donagh

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

POPULATION PYRAMIDS

• WHAT is a population pyramid?

• HOW to read a population pyramid?

• Recognise SHAPESof population pyramids.

• IMPORTANCE of population pyramids.

• It is a diagram that gives information about the proportion of males and females in each age group.

• Also shows:

- proportion of young people (0 -14 )

- proportion of working people (15 – 59)

- proportion of elderly people (60+)

Each age-group designation is called a COHORT

Vertical Axis - Age Groups

Elderly dependents

Working population

Young dependents

Horizontal Axis – Percentage / number

• Read the title e.g. country or city or racial group

• Comment on general shape of the pyramid

• Note the proportion of people in various age groups (cohorts)

• Note the sex ratio

• Interpret the data

1. Triangular-shaped

2. Beehive-shaped Pyramid

3. Rectangular-shaped Pyramid

Shape of pyramids is controlled by

• Births (but mostly CBR!)

• deaths, &

• migrations.

Title: India, 2000

Shape: Broad Base - high birth rates

Narrow Top - small elderly pop

- high death rate

Proportion: - Large proportion of young

- high young dependency

ratio

Sex Ratio: Balance pyramid - Balance sex ratio

• Where is India on the Demographic Transition Model?

2000

Malaysia

2000

Title: Singapore, 2000

Shape: Rocket-shaped / Narrow Base

– Low Birth Rates, Slow pop growth

Proportion: Large proportion of working

population, 15-59 yr old - large

group of economically active pop

Sex Ratio: Balanced pyramid

2000

Taiwan

2000

• Where are Beehive shaped pyramids on the Demographic Transition Model?

Title: Netherlands, 2000

Shape: Rectangular-shaped - Zero Pop Growth

Narrow Base - Low Birth Rates

- Life-expectancy is high e.g. 80+

- Low death rates

Proportion: Bars of equal length - Balance

Proportion

Sex Ratio: Balance pyramid - Balance Sex

Ratio

Netherlands

2000

• Where are Rectangular Based Pyramids on the Demographic Transition Model?

• Population pyramids…show age and gender groups. How do MDC’s and LDC’s differ?

• 1.) Sex Ratio: # of males per 100 females. In general slightly more males born, but women outlive men

• Eur and NA 95 males: 100 females

• World wide 102 males: 100 females

• 2.) Age Distribution

• Dependency Ratio: # of people too old or young to work, compared to # of people in productive yrs.

• % of pop under 15 = % over 65 divided by % in between 15-65 multiplied by 100

• Tells you how many dependents for every 100 workers

• Stage 2 countries: ratio is 1:1 (1 worker for every dependent) Dependents are young

• Stage 4 countries ratio is 2:1 (2 workers for every dependent) Dependents are young and old

• Graying of the pop in MDCs – more than ¼ of all govn’t expenditures in US, Canada, Japan, and W. Eur goes to Social Security, health care, and other programs for the elderly

• Baby Boomer Cohort in US (born 1946-1964)…what does this mean for you?

• Generation X = 1965-1980

• Policy Planning

~ future housing estates

~ future schools

~ future jobs

• Comparison with other countries

~ developed (US) vs developing (India)