Lessons > The Demographic Transition > Step 1
At the most basic level, the increase or decrease in population can be calculated by following the simple formula:
BIRTH RATE - DEATH RATE + IMMIGRATION = GROWTH RATE
(See Unit 5 text for a more extensive explanation.) Please note that our model does not take immigration into account, so we are looking at birth and death rates only. The birth or death rate is the total number of births or deaths per year. However, as you'll see in the simulator, birth rates are normally expressed as number of births per woman (over her whole life) and death rates as a percentage of people who die in each age group.
To get a sense of this continuum, start by running the simulator to 2050 for all seven countries (click on Run button). Record their population growth rates at the end of the simulated period in the Data Table and number the countries by growth rate from highest (earliest in the demographic transition) to lowest (farthest along the transition). Then answer the following questions.