The Demographic Transition Model *hereafter referred to as the DTM

STAGE ONE Population Pyramid Shape Wide bottom, wide top Example None in existence Birth Rate High Death Rate Natural Increase Slow

STAGE ONE Reasons for change in birth rate Children needed to farm High Infant Mortality Rate Religious/Social Encouragement Little Family Planning

STAGE ONE Reasons for change in death rate Disease Famine Little medical access

STAGE TWO Population Pyramid Shape Wide base, narrow top Example 3rd World Birth Rate High Death Rate Rapid Decrease Natural Increase Rapid Increase

STAGE TWO Reasons for change in birth rate Children needed to farm High Infant Mortality Rate Religious/Social Encouragement Little Family Planning

STAGE TWO Reasons for change in death rate Improved medical care Safe/constant water supply Improved sanitation Fewer children die

STAGE THREE Population Pyramid Shape Equilateral triangle Example Brazil, Mexico, India Birth Rate Slowly Falling Death Rate Levels Off Natural Increase Slower Increase

STAGE THREE Reasons for change in birth rate Improved medical care Improved diet Less children needed to work Improved economy

STAGE THREE Reasons for change in death rate Improved medical care Safe/constant water supply Improved sanitation Fewer children die

STAGE FOUR Population Pyramid Shape coffin Example USA, Western Europe, Japan Birth Rate Low Death Rate Natural Increase Stable,Slow

STAGE FOUR Reasons for change in birth rate Family Planning Improved Women’s Status Late Marriage

STAGE FOUR Reasons for change in death rate Excellent Health Care Excellent Food Supply

STAGE FIVE Population Shrinks Postindustrialized