A population pyramid displays age groups on the vertical axis and the percentage or number of males and females on opposite sides. Its shape reveals fertility, mortality, migration and past events. Pakistan has a relatively youthful structure, creating both high dependency and a possible future demographic dividend.
Learning outcomes
- Read and describe the shape of a population pyramid.
- Explain how births, deaths and migration alter age-sex structure.
- Calculate dependency ratios from supplied data.
- Evaluate the economic effects of a youthful population.
Reading the pyramid
A wide base indicates many children and usually high recent birth rates. A narrow top indicates relatively few elderly people and may reflect lower life expectancy. Bulges or indentations can show migration, conflict, epidemics or changes in fertility. Always check whether bars show numbers or percentages.
Sex differences may appear because of migration, different mortality or enumeration problems. A male-heavy working-age group may indicate labour migration into an area, while female-heavy older ages can reflect longer female survival.
Dependency
Dependents are commonly defined as children and older people who are less likely to be in paid work. The dependency ratio compares these groups with the working-age population. A high child dependency ratio increases demand for schools, vaccination, nutrition and future jobs.
Age alone does not determine economic dependence. Some teenagers work, some older people remain employed and some working-age adults are unemployed. The ratio is therefore a useful indicator, not a complete description.
A youthful population
A large youth cohort requires rapid expansion of classrooms, teachers, housing and entry-level employment. If investment is inadequate, class sizes, unemployment and frustration may grow. If health and education improve, the same cohort can become a productive labour force and support innovation and tax revenue.
This potential benefit is the demographic dividend. It is not automatic; it depends on jobs, gender inclusion, skills and stable institutions.
Future ageing
As fertility declines and survival improves, the share of older people eventually rises. Pakistan must plan gradually for chronic disease, pensions, accessible transport and family-care pressures even while youth needs remain dominant.
Good planning uses projections and tests different assumptions rather than treating one forecast as certain.
Key terms
population pyramid • age-sex structure • cohort • dependency ratio • child dependency • old-age dependency • working age • demographic dividend • projection
O Level examination guidance
- Describe specific features: wide base, narrowing sides, bulge or imbalance.
- Do not call all non-working people dependents without reference to the definition used.
- For evaluation, explain what converts a youthful population from pressure into an opportunity.
Review questions
- What does a wide pyramid base usually show?
- Why may a working-age male bulge occur?
- What does the dependency ratio compare?
- Why is the ratio imperfect?
- What is needed for a demographic dividend?
Suggested answers
- A high proportion of children and high recent birth rates.
- Male labour migration into the area.
- Dependent age groups with the working-age population.
- Some dependents work and some working-age adults do not.
- Education, health, jobs, inclusion and effective institutions.
Data and copyright note
These are original KG2UNI notes aligned to Cambridge O Level Pakistan Studies 2059 Paper 2 for the 2026 and 2027 examination syllabuses. Population totals, employment rates and urban shares change over time; use the date and source printed on any examination resource. The notes do not reproduce textbook wording or copyrighted textbook diagrams.
