The dependency ratio is the number of people under age 15 and over age 64 (dependents) compared to the working-age population (ages 15-64); in AP Human Geography it measures the economic burden on workers and signals the consequences of aging or youthful populations.
The dependency ratio compares the people who typically aren't working (everyone under 15 plus everyone over 64) to the people who typically are (ages 15-64). You calculate it by dividing dependents by the working-age population and multiplying by 100. A ratio of 60 means there are 60 dependents for every 100 working-age people. The higher the number, the heavier the load on each worker to fund schools, pensions, and healthcare through taxes and labor.
Geographers split it into two parts because the two halves tell very different stories. The youth dependency ratio (under 15) is high in countries with high birth rates, usually early in the demographic transition. The aged dependency ratio (over 64) climbs in countries with low fertility and long life expectancy, like Japan or Germany. Two countries can have the same overall ratio for opposite reasons, and the AP exam loves asking you to tell them apart using a population pyramid. Wide base means youth dependency; wide top means aged dependency.
Dependency ratio lives in Unit 2 (Population and Migration) and is named directly in the essential knowledge for Topic 2.9, where learning objective 2.9.A asks you to explain the causes and consequences of an aging population. Those consequences (pension strain, healthcare costs, labor shortages) are basically the dependency ratio in action. It also powers Topic 2.3, since reading a population pyramid (EK PSO-2.F.1) is how you estimate a country's dependency ratio at a glance, and Topic 2.7, because pronatalist and immigration policies are governments' main tools for fixing a bad ratio. If a question asks why an aging country might loosen immigration rules or pay families to have babies, the dependency ratio is the answer hiding underneath.
Keep studying AP Human Geography Unit 2
Aging Populations (Unit 2)
This is the dependency ratio's home topic. As a country ages, fewer workers support more retirees, which creates the political pressure for pension and healthcare reform that LO 2.9.A asks you to explain. The dependency ratio is the number that proves the pressure is real.
Population Pyramids and Age Structure (Unit 2)
A population pyramid is the dependency ratio drawn as a picture. A wide base means a high youth dependency ratio, and a top-heavy pyramid means a high aged dependency ratio. On the exam you'll often be handed the pyramid and expected to infer the ratio yourself.
Demographic Transition Model (Unit 2)
The dependency ratio shifts predictably as a country moves through the DTM. Stage 2 countries carry heavy youth dependency from high birth rates, Stage 3 enjoys a sweet spot with lots of workers (sometimes called a demographic dividend), and Stages 4-5 face rising aged dependency.
Pronatalist and Immigration Policies (Unit 2)
Governments don't just watch their dependency ratio climb; they fight it. Pronatalist policies try to grow the future workforce, and immigration policies import working-age people right now. Both are direct attempts to shrink the aged dependency ratio.
Multiple-choice questions usually test the dependency ratio as a consequence or an indicator. Expect stems like which indicator best compares the burden of elderly care across countries, or which trend would increase the old-age dependency ratio in an aging country. The answer hinges on knowing the ratio counts age groups, with falling birth rates and rising life expectancy pushing the aged side up. On free-response questions, the dependency ratio is a go-to piece of evidence whenever a prompt deals with population change. The 2017 FRQ on rates of natural increase, for example, rewarded explanations of the consequences of low natural increase, and rising aged dependency is exactly that kind of consequence. Be ready to read a population pyramid, identify whether the dependency burden is youthful or aged, and explain one economic or political consequence that follows.
Both sound like measures of people not working, but they count completely different things. The dependency ratio is based purely on age categories, so a 70-year-old CEO still counts as a dependent and a jobless 30-year-old still counts as working-age. The unemployment rate measures actual joblessness among people in the labor force. On the AP exam, dependency ratio is the demographic measure, not an employment statistic.
The dependency ratio compares people under 15 and over 64 to the working-age population (15-64), and a higher ratio means more economic strain on each worker.
It splits into a youth dependency ratio (high in Stage 2 countries with high birth rates) and an aged dependency ratio (high in Stage 4-5 countries with low fertility and long life expectancy).
An aging population raises the aged dependency ratio, which creates political and economic pressure to reform pensions, healthcare, and immigration policy, exactly what LO 2.9.A asks you to explain.
Population pyramids are the visual version of the dependency ratio; a wide base signals youth dependency and a top-heavy shape signals aged dependency.
Pronatalist policies and pro-immigration policies are both government responses to a rising aged dependency ratio, since both add future or current workers.
The ratio counts age groups, not employment status, so it is not the same thing as an unemployment rate.
It's the number of dependents (people under 15 and over 64) per 100 working-age people (ages 15-64). It appears in Topic 2.9 as a key consequence of an aging population and shows how much economic weight each worker carries.
Add the population under 15 to the population over 64, divide by the population aged 15-64, and multiply by 100. A result of 50 means 50 dependents for every 100 working-age people.
No. A high ratio can come from either end of the age spectrum. Niger has a high ratio because of huge numbers of children (youth dependency), while Japan has a high ratio because of retirees (aged dependency). The population pyramid tells you which one you're looking at.
The youth dependency ratio counts only people under 15 and is high in early DTM stages with high birth rates. The aged dependency ratio counts only people over 64 and rises in late-stage countries with low fertility and long life expectancy. Same formula structure, opposite causes and policy responses.
A rising aged dependency ratio means fewer taxpayers funding more pensions and healthcare, which is why countries like Japan and Germany have adopted pronatalist incentives or loosened immigration rules. The exam often asks you to connect the ratio to exactly these policy responses from Topic 2.7.