1. 5th Period covered these slides 10/31/16

2. Population Pyramids and the Demographic Transition Model

3. Demographic Transition Model
Outlines natural stages of growth and development
Demographer tool to analyze and understand population numbers and change

4. Population Pyramids
Analyze individual region population growth development trends
Data organized in cohort groups
A tool used by demographers (YOU)
Created by graphing a series of horizontal bar graph lives at intervals of 5 years
Shape- demographer classifies pyramid into four major categories (You will get these as we go along)

5. Demographic Transition Graph

6. A possible Stage 5 would include countries in which fertility rates have fallen significantly below replacement level (2 children) and the elderly population is greater than the youthful population.

7. DTM with 5 Stages

8. Demographic Transition Detailed

9. Demographic Transition Model
Stage 1- high birth, high death=small growth
High infant mortality
Low life expectancy
Common a few hundred years ago, and in developing countries today
In Stage 1, which applied to most of the world before the Industrial Revolution, both birth rates and death rates are high. As a result, population size remains fairly constant but can have major swings with events such as wars or pandemics.

10. Population Pyramids- Early Expanding Stage 1 Of DTM
Wide base= high birth rate
Narrow top= short life expectancy
*few countries today fall in this category

11. P. Pyramids- Early Expanding
Nigeria, 2005

12. Early Expanding
Scotland, 1861

13. P. Pyramids- Early Expanding