The Demographic transitions hand out

Today we read a hand out on the demographic transition.  reading this hand out mad a lot of sense with what we talked about with the population pyramids and NRI, CDR, CBR and other ways to describe the population of a place.  this change in the demographics of a place is split into 4 categories.  Category 1 is when there has not been much growth in a nation.  Both the Birth Rate and death rates are very high which leads to a very small increase in population.  then in stage two, the country undergoes a change economically or medically which causes the death rate to go down, but the birthrate remains the same causing the population to grow fairly quickly.  then in stage three the country continues to grow which causes people to move into cities where it is less necessary to have large families.  This decreases the birth rate which allows the population to increase slowly.  In stage 4 the majority of people are in the workforce, and may not have time for having children wich causes the birthrate to decrease.  As the population in stage 4 begins to age the population can stop increasing, or decrease such as in the case of Japan.