demographic models

So today in class we learned about demographic models, they are essentially graphs used to show the fluctuation of the population in a country throughout the ages of industrialization. They can be used to show change in population, change in the birth and death rate along with the reasons why the changes occurred and the total population, so basically calls it extends the data measured by a countries population and the industrial ages. Every country goes through the industrialization phases some just occur before others do so it may depend on the economy, the different stages are pre, post and industrialization. The phases and stages countries go through can greatly affect their population which could affect their economy and government. So in the middle of class since everyone wouldn't stop talking Mr Schick somewhat gave us a stern talk which I understand we never used to talk so much but now thats all we do and it needs to stop.