science

List of countries by dependency ratio

List of countries by dependency ratio is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand List of countries by dependency ratio rather than just read about it. In short: Dependency ratios are ratios of the numbers of dependents (youths aged 0–14 and/or elderly aged 65+) to the number of working-age adults (15–64). They serve as indicators of population age structures and social support requirements.

Key takeaways

List of countries by dependency ratio belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect List of countries by dependency ratio to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of List of countries by dependency ratio from memory before moving on to harder problems.

Reference excerpt

Dependency ratios are ratios of the numbers of dependents (youths aged 0–14 and/or elderly aged 65+) to the number of working-age adults (15–64). They serve as indicators of population age structures and social support requirements.

Definitions The total dependency ratio is the number of youths and elderly per hundred working-age adults:

Total Dependency Ratio = Number aged 0 to 14 + Number aged at least 65 Number aged 15 to 64 × 100 {\displaystyle {\text{Total Dependency Ratio}}={\frac {{\text{Number aged 0 to 14}}+{\text{Number aged at least 65}}}{\text{Number aged 15 to 64}}}\times 100} .

The youth dependency ratio is the number of youths per hundred working-age adults:

Youth Dependency Ratio = Number aged 0 to 14 Number aged 15 to 64 × 100 {\displaystyle {\text{Youth Dependency Ratio}}={\frac {\text{Number aged 0 to 14}}{\text{Number aged 15 to 64}}}\times 100} .

The elderly dependency ratio is the number of elderly per hundred working-age adults:

Elderly Dependency Ratio = Number aged at least 65 Number aged 15 to 64 × 100 {\displaystyle {\text{Elderly Dependency Ratio}}={\frac {\text{Number aged at least 65}}{\text{Number aged 15 to 64}}}\times 100} .

The potential support ratio is the number of working-age adults per (one) elderly person:

Potential Support Ratio = Number aged 15 to 64 Number aged at least 65 {\displaystyle {\text{Potential Support Ratio}}={\frac {\text{Number aged 15 to 64}}{\text{Number aged at least 65}}}} . Note that the potential support ratio is 100 {\displaystyle 100} times the reciprocal of the elderly dependency ratio (and not simply the reciprocal, as sometimes mistakenly claimed).

List (2024) All data are for 2024 (except the Falkland Islands, which are for 2021) and from CIA World Factbook. Notes:

"China": "data do not include Hong Kong, Macau, and Taiwan" "Cyprus": "data represent the whole country" "Norway": "data include Svalbard and Jan Mayen Islands" "Ukraine": "data include Crimea".

References

Worked examples

Example 1 — a first encounter with List of countries by dependency ratio

Start with the simplest possible case. Write down what List of countries by dependency ratio claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to List of countries by dependency ratio before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about List of countries by dependency ratio ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of List of countries by dependency ratio

In research: List of countries by dependency ratio appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses List of countries by dependency ratio in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: List of countries by dependency ratio is common in secondary-school and first-year university syllabi. It links to neighbouring topics Demographic lists, Lists of countries, Lists of countries by population-related issue, so understanding it makes those chapters shorter.
In everyday life: Look for List of countries by dependency ratio outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study List of countries by dependency ratio in 20 minutes

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Frequently asked questions

What is List of countries by dependency ratio in simple terms?

Why does List of countries by dependency ratio matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study List of countries by dependency ratio?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on List of countries by dependency ratio.