In AP Comparative Government, the dependency ratio is the share of a country's population that is economically dependent (children and the elderly) compared to its working-age population, signaling how much fiscal pressure pensions, healthcare, and education place on the state.
The dependency ratio measures how many people in a country are too young or too old to work compared to how many are in their working years (usually defined as ages 15-64). A high ratio means each worker is effectively supporting more non-workers through taxes, family income, or both.
In AP Comp Gov, this isn't just a demography stat. It's a way to predict political stress. A country with lots of elderly dependents (think the UK or Russia) faces ballooning pension and healthcare costs with a shrinking tax base. A country with lots of young dependents (think Nigeria) has to fund schools and create jobs fast, or risk an unemployed, frustrated youth population. Either way, the dependency ratio tells you where government resources will get squeezed, which is exactly what Topic 5.8 (Causes and Effects of Demographic Change) asks you to explain.
Dependency ratio lives in Unit 5 (Political and Economic Changes and Development), Topic 5.8, under learning objective AP Comp Gov 5.8.A: explain political causes and consequences of demographic changes. The essential knowledge here (LEG-4.A.1) is blunt about it: demographic changes pose significant challenges to governmental resources. The dependency ratio is the cleanest number for showing that challenge. It also connects backward to deliberate state policy. China's one-child policy lowered the youth dependency ratio for decades, then created a looming elderly dependency crisis, which is a textbook example of a policy choice producing a long-term demographic consequence. If an exam question hands you population data and asks about consequences for the state, the dependency ratio is usually the bridge between the numbers and the politics.
Keep studying AP® Comparative Government Unit 5
Population pyramid (Unit 5)
A population pyramid is the dependency ratio drawn as a picture. A wide base means high youth dependency (Nigeria); a top-heavy shape means high elderly dependency (the UK or China's future). The 2019 exam used China and Nigeria pyramids exactly this way, expecting you to read the shape and explain the consequences.
One-child policy (Unit 5)
China's one-child policy is the course's clearest case of a government directly engineering its dependency ratio. It cut youth dependency in the short run, fueling economic growth, but produced a rapidly aging population that now threatens pension systems and shrinks the future workforce.
Aging population (Unit 5)
An aging population is the trend; a rising elderly dependency ratio is the measurement. Russia and the UK both face this, and the political consequence is the same squeeze: more spending on pensions and healthcare funded by fewer workers.
Hukou system (Unit 5)
China's hukou system controls rural-to-urban migration, which shapes where dependents and workers actually live. Working-age migrants flow to cities while children and elderly stay in rural areas, so the dependency burden lands unevenly across regions, deepening the regional differences LEG-4.A.2 describes.
Dependency ratio shows up in two main ways. First, in quantitative or stimulus-based questions where you're given data and asked to draw the fiscal conclusion. For example, a question might tell you the UK's working-age share fell from 66% to 61% between 2000 and 2020 while the 65+ share rose from 16% to 19%, then ask what that means for government resources (answer: fewer taxpayers funding more pension and healthcare spending). Second, in conceptual-analysis questions tied to course countries, like the 2019 free-response question that used population pyramids of China and Nigeria. The move the exam rewards is always the same. Don't just describe the data. Connect it to a consequence for the state, such as pension strain, education and job-creation pressure, or policy responses like ending the one-child policy.
The dependency ratio is a number; the population pyramid is a graph. The pyramid shows the full age and sex structure of a population, while the dependency ratio compresses that structure into one figure comparing dependents to workers. On the exam you'll often read the pyramid's shape to estimate the dependency ratio, then use the ratio to explain the political consequence.
The dependency ratio compares the non-working population (young children and the elderly) to the working-age population, usually ages 15-64.
A high dependency ratio strains government resources because fewer taxpayers must fund more spending on pensions, healthcare, and education.
There are two flavors of dependency pressure: youth dependency (Nigeria's wide-based pyramid) and elderly dependency (the UK's and China's aging populations), and each creates different policy demands.
China's one-child policy deliberately lowered youth dependency to boost growth, but it created a future elderly dependency crisis, which is why the policy was eventually abandoned.
On the exam, never stop at describing the data. Always link a changing dependency ratio to a political consequence for the state, like fiscal strain or policy reform.
It's the proportion of a population that is economically dependent (children and the elderly) relative to the working-age population. AP Comp Gov uses it in Topic 5.8 to explain how demographic change strains government resources.
No. A dependency ratio can be high because of lots of elderly people (like the UK, where the 65+ share rose from 16% to 19% between 2000 and 2020) or lots of children (like Nigeria, with its wide-based population pyramid). The political consequences differ: pension strain versus pressure to fund schools and create jobs.
The dependency ratio is a single number; a population pyramid is a graph showing the full age and sex breakdown. You can estimate the ratio from the pyramid's shape, which is exactly the skill the 2019 free-response question on China and Nigeria tested.
The one-child policy shrank the number of young dependents for decades, which boosted growth, but it also means China's working-age population is now shrinking while its elderly population balloons. That rising elderly dependency ratio is why China reversed the policy.
Because dependents consume government spending while workers fund it. When the ratio rises, the state faces hard choices like raising taxes, raising the retirement age, cutting benefits, or encouraging immigration, all of which carry political costs.
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