Why does population grow faster in some places than in others
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Why does population grow faster in some places than in others?. Demographic Transition Model. Demographic: Think population Transition: Think change In order to understand this concept, you must be comfortable with this vocabulary: CBR, CDR, NIR , Infant mortality, revolution.

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Why does population grow faster in some places than in others

Why does population grow faster in some places than in others?

Demographic Transition Model


  • Demographic: others?Think population

  • Transition: Think change

  • In order to understand this concept, you must be comfortable with this vocabulary:

    • CBR, CDR, NIR, Infant mortality, revolution



Stage one low growth
STAGE ONE: LOW GROWTH and mortality rates

  • Early human societies to about 1750.

  • Birth rates and death rates were roughly equal

  • Infant mortality was high

  • Since CBR and CDR were about the same, natural increase was low


Stage one
STAGE ONE and mortality rates

  • Population grew toward the end of Stage One because of the AGRICULTURAL REVOLUTION, when humans used agriculture for the first time.


Stage two high growth
STAGE TWO: HIGH GROWTH and mortality rates

  • CDR drops dramatically

  • CBR remains about the same

  • Since CBR > CDR, population grows


Causes of stage two
CAUSES OF STAGE TWO and mortality rates

  • Industrial Revolution

    • Europe, U.S., Canada

  • Being able to make products quickly led to greater wealth—being able to ensure supplies of food.

  • 1750s-1800s

  • Medical Revolution

    • Africa, Asia, Latin America

  • Improved medical practices in Europe diffused to Africa, Asia, and Latin America

  • This cut down on tradition forms of death from disease

  • Mid 1900s


Stage three moderate growth
STAGE THREE: MODERATE GROWTH and mortality rates

  • A country is in Stage 3 when the CBR and TFR start to drop rapidly.

  • The drop is a result of social customs, not technological changes.

  • People in Stage 3 countries are likely to live in cities and no longer need large families.


Stage four low growth
STAGE FOUR: LOW GROWTH and mortality rates

  • Stage 4 countries have CBRs that are nearly equal to CDRs.

  • NIR drops to near zero, a condition called ZERO POPULATION GROWTH (ZPG).

  • ZPG means that the TFR is around 2.1, the replacement rate


Why do countries reach stage four
WHY DO COUNTRIES REACH STAGE FOUR? and mortality rates

  • Women’s education and work

    • Fewer children for working women

    • First children are born later in life (after college), leaving less time to produce more.


Reasons for stage 4
REASONS FOR STAGE 4 and mortality rates

  • Birth control and Family Planning

    • Use of contraceptives—including condoms and “the pill” help prevent pregnancy

  • More money and free time=attending events without children

    • Travel overseas

    • Attending plays and shows

    • Dining at restaurants


Stage 2 population pyramid
STAGE 2 POPULATION PYRAMID and mortality rates


Stage 3 population pyramid
STAGE 3 POPULATION PYRAMID and mortality rates


Stage 4 population pyramid
STAGE 4 POPULATION PYRAMID and mortality rates


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