1. Cole Cantrell and Grant McNulty 4 th Block

2.  This model can be used to show how developed a country is  It contains 4 stages, with a possible 5 th stage  Calculated with the Crude Birth Rate, CBR, and the Crude Death Rate, CDR  Population pyramids have a correlation to each stage

3.  In Stage 1, people will be hunters and gathers  Currently, there are no countries are in Stage 1.  The First Agricultural Revolution has allowed all countries to pass Stage 1.  The CBR and CDR vary widely causing low population growth

4.  In Stage 2, the world population has spiked and grows rapidly  The CBR remains high, while the CDR has dropped significantly, causing high growth  The Industrial Revolution and Medical Revolution  Currently, many African, Latin American, and some Asian countries are in Stage 2

5. As shown by the population pyramid, Stage 2’s pyramid, look like an average pyramid.

6.  In Stage 3, the population grows, but more slowly than in Stage 2  The CDR continues to lower, but the CBR also lowers but not as fast as the CDR.  Many European and North American countries moved to Stage 3 in the 1950s, and Latin American, and Asian countries have moved up to Stage 3 recently.  Economic changes has allowed more jobs and women to join the work force, resulting in the lesser chance of having kids

7. The population pyramid in a Stage 3 country has a more box shape to it.

8.  In Stage 4, little population occurs, or the country reaches zero population growth\  The gap between the CBR and CDR continues to decrease, or the two overlap  Very few countries are in Stage 4, typically European countries  The total fertility rate, the average of how many children a women has, is below the Natural Increase Rate, 2.1 children

9. Population pyramids in Stage 4 looks like an upside down pyramid.

10.  Some geographers believe that the Demographic Transition Model has a 5 th stage  In Stage 5, the CBR will be below the CDR, and the population would begin to decline  It is debated on whether few countries, such as Germany, are in Stage 5