1. Population
© Robert J. Atkins, Ph.D.

3. What are six basic demographic (population) terms?
Demography
The study of human population
Fertility
Amount of childbearing in a population
Several measurements of this

4. Demographic terms (cont.)
Crude birth rate
Live births per 1,000 people each year
High income nations e.g. U.S. = lower than average crude birth rate
The lower the average income, the higher the population increase

5. Demographic terms (Cont.)
Fecundity rate
Maximum possible childbearing
Sex Ratio
Males for every 100 females
Zero Population growth (ZPG)
Two people produce two people
Maintains population at a steady state

6. Do you remember? What are the six basic demographic terms?
What do they measure?

7. What is the world population?
Currently
7 Billion
Most of human history the population of the entire earth was 500 Million (1/2 billion)

8. Something to think about:
Why do developing nations contribute so much more
to the world population?

9. Why do people have so many children?
Through most of human history:
Birth control was not reliable
Children were needed for the farm
High death rates = many children did not reach adulthood

10. What is the Malthusian theory?
Food increasing arithmetically
Pop. Increasing geometrically
Result : People reproducing beyond what the planet can support
Out-stripping resources
Poisoning the planet

11. What is the Malthusian theory?
Population increases geometrically
Food increases arithmetically
Population
Food
Population could increase beyond what the planet could support

12. What is the Demographic Transition Theory?
Population patterns reflect a society’s level of technological development
From preindustrial (high births & deaths) = slow population growth
To postindustrial (low births & deaths) = slow or stable population growth
Between these two, high birth rate & low death rate = rapidly expanding population

13. Do you remember? What is the current world population?
Why did people have so many children?
What is the Malthusian theory?
What is the Demographic Transition theory?