Population Pyramids

Population Pyramid or Age-Sex Ratio Aka Age-sex ratio Bars are called cohort – must explain cohort

1931-1935 Remember WWII just ended 0-4 result of baby boom 1931-1935 – great depression affected choice to have babies

1946-1950 Demographic momentum – the more people you have in child-rearing ages the more children you will have (compounded by high TFR, but even with low TFR you will have an echo boom) Echo Boom

1946-1950 Echo Boom Should start noticing the change in shape

? Carefully worded question – What is going on with that blue bar on top? Ans. Not just a 5 year cohort

a. occurred in the years immediately following World War I 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 c

Typical pyramids

E A C B D Indicates: Women live longer Lower CBR High Life Expectancy Disease, plague or gender specific deaths A baby boom http://geographyfieldwork.com/PopulationStructure.htm

http://ecp3113-01.fa01.fsu.edu/lively_introduction/fig7.gif 1

A B C D Which population pyramid is from the least developed country? D –Rwanda 2000 Which population pyramid is from the least developed country?

A B C D Which population pyramid is from the most developed country? B – Andorra 2050 Which population pyramid is from the most developed country?

Change of scale is necessitated by country’s demographics

Remember Germany is not a core country even though its demographics look equivalent to core countries. Its other indicators demonstrate semi-periphery (by definition semi-periphery means hit or miss)

Result of migrant workers – not allowed to bring families, marry locals, or have children with locals. So work, leave and leave no trace

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. 1

Aging population… …declining birth rate 1

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Mammoni: “Mama’s Boy” http://marketplace.publicradio.org/display/web/2007/11/22/why_italian_men_wont_leave_the_nest/# 1

How is this population pyramid different from Italy’s? 1

http://www.townsendchamber.org 1

http://bcs. wiley. com/he-bcs/Books http://bcs.wiley.com/he-bcs/Books?action=resource&bcsId=3206&itemId=0471701211&resourceId=8133 Connects to Wiley – choose 5.1 – gives scenario and pick correct pyramid

Typical pyramids 2. LDC? 3. High CBR? 4. High Life Expectancy? 5. High Population Growth? 6. Stage 4/5?

A B C D For review after dtm 7. Stage 1? 2? 3? 4?

8. A population pyramid with a wide base and narrow top is indicative of developed countries. 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 __________. 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 high CBR d. an aging population an out of balance sex ratio 12. The population pyramid of Naples, Florida is “upside down,” because the city has a large percentage of 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 Extra stuff http://www.ined.fr/en/everything_about_population/graph_month/fertility_mortality_africa/