population pyramids. population pyramid or age-sex ratio
TRANSCRIPT
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/