Canadian & World Issueswww.CraigMarlatt.com/school

Demographics

Demographics

1. Studying Population

2. Population Pyramids

3. Global Village

Studying Population

• Population Geography– The study of SPATIAL variations in the distribution,

composition, migration, and growth of populations over time.

• Demography– The study of human population dynamics. It looks at

how populations change over time due to births, deaths, migration and ageing.

• Demographics– A term for population characteristics. Demographics

include birth rate, death rate, immigration, age, income, sex, education, occupation, religion, nationality, …

Studying Population

Population change over time will inevitably affect….

• Political Systems

• Economics

• Social Structures

• Environments

Studying Population

0

1

2

3

4

5

6

7

8

9

Source: United Nations Populations Division, World Population Prospects, The 2004 Revision, medium variant.

Developing countries

Billions

Developed countries

Studying Population

• Factors that may lead to population increase include:– Food– Health– Economic Growth– Migration

Studying Population

• Growth Rate– the number of persons added to (or subtracted from)

a population due to natural increase and net migration.

• Birth rate: number of live births per 1,000 population per year.

• Death rate: number of deaths per 1,000 population per year.

• Rate of Natural Increase – birth rate – death rate = rate of natural increase

Studying Population

• Factors that contribute to the decline in death rate include:– Better Nutrition– Better Access to Medical Care– Improved Sanitation– Better Immunization

• Net Migration = immigrants – emigrants

Studying Population

• Effects of Population Increase– Increased poverty – Resource depletion – Medicine shortages– Urban sprawl

Studying Population

• A specific pattern of population growth has occurred in many developed nations during the past 60 years.

1945 1965 1985 2005 2025

Birt

hs Baby Boom

Generation X

Baby Echo

Generation Y

Studying Population

• Factors that may lead to population decline– Heavy Emigration– Disease– Famine– War– Sub-replacement Fertility

• a fertility rate that is not high enough to replace an area’s population. Sub-replacement fertility rate is 2.1 children per woman or higher.

Studying Population

• Population Decline in the past– The Black Death– Old World Diseases– Potato Famine

• Population Decline today– Sub-replacement Fertility Levels– Migration (to be discussed in the next lesson)

• Why low sub-replacement fertility rate?– Urbanization– Contraception– Government Policies

• Exception: United States where natural increase rates have remained stable…

• And within the US, incredible regional variations

Studying Population

2.03

1.9

1.77

1.74

1.73

1.72

1.49

1.3

1.3

1.28

1.26

1.19

United States

France

Australia

Sweden

Netherlands

United Kingdom

Canada

Spain

Germany

J apan

I taly

South Korea

Average Number of Children per Woman

Source: PRB, 2005 World Population Data Sheet.

Studying Population

Studying Population

• Effects of Population Decline:– Deflation – Rise in the standard of living– Population aging – Small impact on the environment– Political power?

300 200 100 00 100 200 300

0-4

10-14

20-24

30-34

40-44

50-54

60-64

70-74

80+

Females

Source: United Nations Populations Division, World Population Prospects, The 2004 Revision.

Age

Males

Millions

In the developed countries, there are fewer and fewer young people and more and more elderly.

Studying Population

300 200 100 00 100 200 300

0-4

10-14

20-24

30-34

40-44

50-54

60-64

70-74

80-84

90+

Source: United Nations Populations Division, World Population Prospects, The 2004 Revision.

Females

Age

Males

Millions

The young population of the developing countries translates to great growth potential.

Studying Population

Europe is the only world region projected to decline in population by 2050.

728

1,941

668

778

457

549

326

885

3,8755,385Asia

Africa

Europe

LatinAmerica/Caribbean

North America

2050

2005

Millions

Studying Population

Population Pyramids

• A population pyramid is two back-to-back bar graphs, one showing the number of males and one showing females in a particular population in five-year age groups (also called cohorts).

• A great deal of information about the population broken down by age and sex can be read from a population pyramid, and this can shed light on the extent of its development.– Birth rate trends– Death rate trends– Number of economic dependents (<15, >65)

Population Pyramids

• Three basic shapes of population pyramids.

Population Pyramids – CAN 1961

Depression

Baby Boom

Aging Population

Population Pyramids – CAN 2006

Population Pyramids – US 1990

Population Pyramids – US 2000

Population Pyramids – US 2025

Population Pyramids – US 2050

Population Pyramids – US 2100