What does the dependency ratio measure in a population?

Question

Accepted Answer

The ratio of non-working-age population to working-age population. The dependency ratio measures the proportion of a population that is not in the working-age group (typically defined as ages 15-64) relative to those who are of working age. It is calculated by dividing the number of people ages 0-14 and 65+ by the number of people ages 15-64, often expressed as a ratio per 100 working-age people. A high dependency ratio indicates that each working-age person must support more dependents (children and elderly), which has implications for economic productivity, social services, healthcare costs, and pension systems.

The ratio of births to deaths in a given year describes the vital index or components of natural increase, which measures population growth dynamics rather than the age structure of economic dependence. The ratio of immigrants to emigrants in a country relates to net migration patterns, which describes population movement rather than the balance between productive and dependent age groups. The ratio of urban to rural population describes the level of urbanization, which is a settlement pattern measure rather than an indicator of age-based economic dependency.

The dependency ratio is an important demographic indicator tested on the DSST exam because it connects population age structure to economic and social outcomes. Countries with young populations (like many in sub-Saharan Africa) have high youth dependency ratios, while aging societies (like Japan and many European nations) face high elderly dependency ratios. Understanding this metric helps explain different development challenges and policy priorities across regions.

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