11/13/18

a demographic transition model shows how the birth and death rate go from high to low in a certain area. demographic transition has four stages. stage one, pre-transition, has a high birth rate and a “high fluctuating death rate”. i don’t really know what that means. stage two, early transition, the death rate starts to go down. birth rates stay about the same, so the population increases. stage three, late transition, the population declines as birth rates slowly drop. stage four is post transition, which is after the birth and death rates go down.

i just figured out i can add pictures so that’s pretty cool. this is a demographic transition model. the bottom shows the four stages, and what the change in population is over each stage. 

 

here’s one that shows 5 stages. the fifth stage is when country’s population goes down because the death rate is higher than the birth rate.