Population
EconomicsΒ· 5.3 Population (2023-2026 syllabus)Β· 45 min read
1. Key Population Indicatorsβ β ββββ± 10 min
Population indicators are standardised metrics used to measure changes in population size, growth, and structure. Governments use these metrics to plan public services, set labour market policies, and track economic development progress.
Population indicators
Quantitative metrics used to describe the size, growth rate, and composition of a country's population.
Birth rate: Number of live births per 1,000 people per year
Death rate: Number of deaths per 1,000 people per year
Natural increase: Birth rate minus death rate, expressed per 1,000 or as a percentage
Dependency ratio: (Number of 0-14 year olds + 65+ year olds) / Number of 15-64 year olds Γ 100
Net migration: Number of immigrants minus number of emigrants per 1,000 people per year
A country has a birth rate of 19 per 1,000, death rate of 7 per 1,000, and net migration of -3 per 1,000. Calculate its natural increase rate and overall population growth rate.
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Step 1: Calculate natural increase by subtracting death rate from birth rate
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Step 2: Calculate overall population growth by adding net migration to natural increase
Exam tip:
Always show full working for calculation questions, as marks are awarded for correct method even if your final answer is miscalculated.
2. Demographic Transition Model (DTM)β β β βββ± 12 min
The DTM is a generalised model that tracks how birth and death rates change as a country moves from a low-income pre-industrial economy to a high-income developed economy, across four core stages.
Demographic Transition Model
Model describing the historical shift of birth and death rates from high to low levels as a country develops economically.
DTM Stage | Birth Rate | Death Rate | Natural Increase | Typical Country Type |
|---|---|---|---|---|
1 | High, fluctuating | High, fluctuating | Very low | Low-income pre-industrial |
2 | High, stable | Rapidly falling | Very high | Low-income developing |
3 | Rapidly falling | Low, stable | High, falling | Middle-income emerging |
4 | Low, stable | Low, stable | Very low / negative | High-income developed |
A country has a birth rate of 8 per 1,000, death rate of 11 per 1,000, and 22% of its population is aged 65+. Identify its most likely DTM stage and explain one economic consequence of this trend.
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Step 1: Identify the DTM stage: Low birth rate, death rate slightly above birth rate (negative natural increase), and high share of elderly population = Stage 4 (or Stage 5 variant), typical of high-income developed countries.
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Step 2: Economic consequence: The shrinking working-age population will raise the dependency ratio, as fewer workers pay taxes to fund public pensions and healthcare for the growing elderly population, putting pressure on government budgets.
Exam tip:
When describing DTM stages, always link rate changes to specific economic or social causes (e.g. improved healthcare, access to contraception) to access full marks.
3. Population Types and Economic Impactsβ β β βββ± 10 min
Populations are classified relative to a country's available resources and technological capacity, rather than by absolute size or density. The three core classifications are optimum, overpopulation, and underpopulation.
Optimum population
The population size that maximises output per worker and average living standards, given a country's existing resources and level of technology.
Overpopulation: Population size exceeds the optimum, leading to falling output per capita, high unemployment, strain on public services, and environmental degradation.
Underpopulation: Population size is below the optimum, leading to underutilised resources, labour shortages, falling tax revenues, and slower economic growth.
A large country with extensive agricultural land and renewable energy resources has a 12% unemployment rate, overcrowded schools, and widespread water shortages. Classify its population type and explain one short-term impact.
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Step 1: Classify population type: The country is overpopulated, as its population size exceeds the capacity of its resources and public services to support high living standards.
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Step 2: Short-term impact: High youth unemployment will lead to lost output, increased poverty rates, and higher government spending on welfare support, reducing funds available for investment in infrastructure.
Exam tip:
When analysing over/underpopulation, always link points to specific economic outcomes (e.g. output per capita, unemployment, government spending) rather than general social comments.
4. Government Population Policiesβ β β β ββ± 12 min
Governments implement population policies to adjust population growth or structure to support economic development objectives. The two core policy types are anti-natalist (to slow growth) and pro-natalist (to boost growth).
Anti-natalist policies: Used in countries with high population growth: include free contraception, family planning education campaigns, and limits on family size.
Pro-natalist policies: Used in countries with ageing populations or negative growth: include cash benefits for children, subsidised childcare, and extended parental leave.
A high-income country has a negative natural increase rate and rising dependency ratio. Evaluate one pro-natalist policy the government could use to address this issue.
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Step 1: Policy choice: The government could introduce subsidised childcare for all children under 5, reducing the cost of raising children for working parents.
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Step 2: Advantage: This policy will make it easier for women to balance work and having children, increasing birth rates over time, and boosting female labour force participation in the short term.
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Step 3: Disadvantage: The policy is expensive to fund, requiring higher taxes or cuts to other public services, and may take 15-20 years to increase the working-age population.
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Step 4: Conclusion: It is an effective long-term policy, but should be paired with targeted immigration of working-age people to address immediate labour shortages.
Exam tip:
For 8-mark evaluation questions on policies, include at least one advantage, one disadvantage, and a clear concluding judgement to access the highest mark bands.
5. Interpreting Population Pyramidsβ β β βββ± 11 min
A population pyramid is a chart of a country's age and gender structure. Age groups are stacked from the youngest at the bottom to the oldest at the top, with males on one side and females on the other. The width of each bar shows the share of the population in that age group. In the 0455 syllabus you are required to interpret a population pyramid, but you are not required to draw one.
Population pyramid
A chart showing the age and gender structure of a population, with age groups stacked from youngest (bottom) to oldest (top) and males and females on opposite sides.
Wide base (many children aged 0β14): a high birth rate and a large young population, giving a high youth dependency ratio β typical of a less economically developed country.
Narrow top (few people aged 65+): a low life expectancy and/or few elderly, again typical of lower-income countries.
Narrow base with a wide middle and top: a low birth rate and an ageing population, giving a high old-age dependency ratio β typical of a high-income developed country.
A wide middle (ages 15β64): a large working-age population and a low dependency ratio, which can support faster growth if these workers are employed.
Age group | Males (% of total population) | Females (% of total population) |
|---|---|---|
0β14 | 20 | 18 |
15β64 | 29 | 29 |
65+ | 2 | 2 |
The population pyramid summarised in the table above has a very wide base and a very narrow top. Interpret what it shows about the country's age structure, dependency and likely stage of development.
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Step 1 β Age structure: 38% of the population is aged 0β14 (a very wide base) and only 4% is aged 65+ (a very narrow top), so the population is dominated by children and young people, with few elderly.
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Step 2 β Dependency: The large share of children means a high youth dependency ratio, so the 58% of working age must support many young dependents through spending on schools, healthcare and housing.
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Step 3 β Development stage: A wide base and narrow top (high birth rate, low life expectancy) is typical of a lower-income, less economically developed country. If these children are educated and later employed, the wide base could become a large future workforce.
Exam tip:
For 0455 you must be able to interpret a population pyramid, but you are never asked to draw one. Practise reading age structure, dependency and development stage straight from the shape.
6. Common Pitfalls
Wrong move:
Confusing natural increase with overall population growth
Why:
Natural increase only counts births minus deaths, ignoring migration which is a major driver of population change in many countries
Correct move:
Always specify which measure you are referring to, and include net migration when calculating overall population growth
Wrong move:
Claiming all countries follow the DTM exactly
Why:
The DTM is a generalisation, not a rule: some countries skip stages due to rapid access to healthcare, or have slower transitions due to cultural norms
Correct move:
Refer to the DTM as a general model, and note exceptions when applying it to specific country contexts
Wrong move:
Defining overpopulation only by large total population or high density
Why:
Overpopulation is relative to resources and technology: a small country with few resources can be overpopulated, while a dense high-tech country can be at optimum population
Correct move:
Always link over/underpopulation to output per capita and resource availability, not just absolute population size
Wrong move:
Only listing advantages or disadvantages of population policies in evaluation questions
Why:
Evaluation questions require balanced analysis and a judgement to access full marks
Correct move:
Include at least one positive and one negative impact of any policy, followed by a clear concluding judgement on its suitability
Wrong move:
Forgetting to show working for population calculation questions
Why:
Examiners award marks for correct method, even if your final answer is miscalculated
Correct move:
Write down each step of your calculation clearly, including the formula used, before giving your final answer
7. Quick Reference Cheatsheet
Concept | Definition | Key Exam Point |
|---|---|---|
Birth rate | Live births per 1,000 people per year | Used to calculate natural increase |
Dependency ratio | (Dependents / Working age population) Γ 100 | Higher ratio = more pressure on government budgets |
DTM Stage 2 | High birth rate, rapidly falling death rate | Typical of low-income developing countries |
Overpopulation | Population exceeds optimum size | Causes unemployment and strain on public services |
Anti-natalist policy | Policy to reduce birth rates | Used in countries with very high population growth |
Pro-natalist policy | Policy to increase birth rates | Used in countries with ageing populations |
8. Frequently Asked
What is the difference between natural increase and overall population growth?
Natural increase only accounts for the gap between birth and death rates, while overall population growth also includes net migration (immigration minus emigration).
Do all countries follow the Demographic Transition Model exactly?
No, the DTM is a generalisation. Some countries skip stages due to rapid access to healthcare, while others have slower transitions due to cultural or religious norms affecting birth rates.
Going deeper
What's Next
Now that you have mastered population content for CIE IGCSE Economics 0455, you can progress to related topics in the Economic Development unit to build your full exam preparation. Population dynamics directly impact labour markets, poverty levels, and government spending priorities, so this knowledge is critical for evaluating development strategies in different country contexts. You will apply this content when analysing gaps in development between countries, and when evaluating policy interventions to boost living standards. Be sure to practice structured response questions on population impacts and policy evaluation, as these are frequently tested as 6-8 mark questions in Paper 2.