Population Pyramids

Population Pyramid or Age-Sex Ratio

1931-1935

1946-1950

Echo Boom

1946-1950

Echo Boom

?

1. The baby boom

a. occurred in the years immediately following World War I

b. was a result of free love during the 1960’s

c. was fostered by economic prosperity and relative peace

d. was limited to California and the West

Typical pyramids

http://geographyfieldwork.com/PopulationStructure.htm

A

BD

C

EIndicates:

• Women live longer

• Lower CBR

• High Life Expectancy

• Disease, plague or gender specific deaths

• A baby boom

http://ecp3113-01.fa01.fsu.edu/lively_introduction/fig7.gif

A

DC

B

Which population pyramid is from the least developed country?

A

DC

B

Which population pyramid is from the most developed country?

Analysis of Italy’s Population Pyramid

• 1. Decline in Birth Rate• 2. Baby Boom• 3. Fewer men due to World War I and II • 4. More women due to: a. longer life

expectancy and b. World Wars (I and II) • 5. More 75-79 yrs than 0-4 yrs. Signs of

a future worker shortage and an overall declining population.

Aging population…

…declining birth rate

10 8 6 4 2 0 2 4 6 8 10

0-4 yrs.

5-9 yrs.

10-14 yrs.

15-19 yrs.

20-24 yrs

25-29 yrs

30-34 yrs.

35-39 yrs.

40-44 yrs.

45-49 yrs.

50-54 yrs.

55-59 yrs.

60-64 yrs.

65-69 yrs.

70-74 yrs.

75-79 yrs.

80+ yrs.

AGE

PERCENT

Males(%)Females(%)

Italy, 2000

10 8 6 4 2 0 2 4 6 8 10

0-4 yrs.

5-9 yrs.

10-14 yrs.

15-19 yrs.

20-24 yrs

25-29 yrs

30-34 yrs.

35-39 yrs.

40-44 yrs.

45-49 yrs.

50-54 yrs.

55-59 yrs.

60-64 yrs.

65-69 yrs.

70-74 yrs.

75-79 yrs.

80+ yrs.

AGE

PERCENT

Males(%)Females(%)

Italy, 2025

10 8 6 4 2 0 2 4 6 8 10

0-4 yrs.

5-9 yrs.

10-14 yrs.

15-19 yrs.

20-24 yrs

25-29 yrs

30-34 yrs.

35-39 yrs.

40-44 yrs.

45-49 yrs.

50-54 yrs.

55-59 yrs.

60-64 yrs.

65-69 yrs.

70-74 yrs.

75-79 yrs.

80+ yrs.

AGE

PERCENT

Males(%)Females(%)

Italy, 2050

http://marketplace.publicradio.org/display/web/2007/11/22/why_italian_men_wont_leave_the_nest/#

Mammoni: “Mama’s Boy”

How is this population pyramid

different from Italy’s?

http://www.townsendchamber.org

• http://bcs.wiley.com/he-bcs/Books?action=resource&bcsId=3206&itemId=0471701211&resourceId=8133

Typical pyramids

2. LDC?

3. High CBR?

4. High Life Expectancy?

5. High Population Growth?

6. Stage 4/5?

A

DC

B

7. Stage 1? 2? 3? 4?

8. A population pyramid with a wide base and narrow top is indicative of

a. developed countries. b. b. countries in Stage IV of the demographic

transition.c. developing countries. d. low infant mortality.

9. A developed country that has reached a stage where the population is most stable will develop a population pyramid that is __________.

a. bell shaped b. pear shaped c. rectangular shaped d. cone shaped

10. The country with the narrowest population pyramid is [hint: You probably will not know what that exact country’s population pyramid looks like, but stop and think about. Why were these countries chosen? What do they represent?]

a. Niger b. Chile

c. Denmark d. United States

11. What significant population problem does the United States, as well as other MDCs, facing?

a. high infant mortality b. high CDR

c. high CBR d. an aging population

e. an out of balance sex ratio

12. The population pyramid of Naples, Florida is “upside down,” because the city has a large percentage of

a. females b. infants

c. elderly people d. young people

Changes in Size of Household in China

http://www.npfpc.gov.cn/en/detail.aspx?articleid=090430103634500835

http://www.ined.fr/en/everything_about_population/graph_month/fertility_mortality_africa/