TFR total fertility rate if it is in the shape of the pyramid then the population will go up and it is developing because young people will have kids but if it is not in a pyramid then the population will go down because old people can not have babies. If population is 2.1 then it will go up but if 2.0 it will go down. 3 things that tell if population is going up or down 1. how many people die 2. births 3. immigrants. Life expectancy-how long you are expected to live.