Today we had a 2 hour delay because of the snow that we received yesterday so I got to sleep in which was a bonus. We still had all of our classes today but they were shortened. In this class today we took a bunch of notes about population structure and here they are below.
- Sex ratio is defined as the number of males per 1000 females in the population
- Demographic transition is a model consisting of our stages that help to explain the rising and falling of natural increase over time in a country
- Historically, no country has ever reverted back to a previous stage
- Thus, the model has a beginning, middle and end
- Stage 1- marked by very high birth and death rates and no long term natural increase
- Stage 2- marked by rapidly declining death rates and very high birth rates
- They have a high natural increase and consist of Europe and North America during the industrial revolution
- Stage 3- marked by rapid decline in birth rates and steady decline in death rates
- The natural increase is moderate
- Stage 4- marked by very low birth and death rates and no long term natural increase and possible a decrease
- Country reaches stage 4 when the population gains by CBR are diminished by losses because of CDR
- The condition is known as zero population growth (ZPG)
- Demographers more precisely define ZPG as the TFR that produces no population change
- The population changes from immigration
All in all class went pretty well today and it all of my classes were only 40 minutes which was a bonus especially for a Friday.
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