american demographer warren thompson created the demographic transition model (dtm).
american demographer warren thompson created the demographic transition model (dtm).
who created the demographic transition model (dtm)?
american demographer warren thompson
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the age-dependency ratio can determine which stage in the demographic transition model a certain country is in. the dependency ratio acts like a rollercoaster when going through the stages of the demographic transition model. during stages 1 and 2, the dependency ratio is high due to significantly high crude birth rates putting pressure onto the smaller working-age population to take care of all of them. in stage 3, the dependency ratio starts to decrease because fertility and mortality rates start to decrease which shows that the proportion of adults to the young and elderly are much larger in this stage. in stages 4 and 5, the dependency ratio starts to increase once again as the working-age population retires. because fertility rates caused the younger population to decrease, once they grow up and start working, there will be more pressure for them to take care of the previous working-age population that just retired since there will be more young and elderly people than working-age adults during that time period. the population structure of a country is an important factor for determining the economic status of their country. japan is a great example of an aging population. they have a 1:4 ratio of people 65 years and older. this causes trouble for them because there is not enough people in the working-age population to support all of the elders. rwanda is another example of a population that struggles with a younger population (also known as the "youth bulge"). both of these countries are struggling with high dependency ratios even though both countries are on opposite stages of the demographic transition model.
dependency ratio