Key Idea: Topic 1.1 is about where people live, why, and how a country's wealth shapes its population. It pulls together two ideas: 1.1.1 — distribution & density: the physical factors (climate, relief, water, soils) and human factors (economy, history, politics) that make population spread so uneven across the world. 1.1.2 — development & fertility: how rising economic development drives the demographic transition — birth rates fall, the population ages, and for a window a country can enjoy a demographic dividend. This is core content, examined on Paper 2 — a data-response read off a population map or graph, a short structured Explain, and it can feed the extended-response essay.
🗺️ 1.1.1 — Where people live, and why
Population is spread unevenly: a few areas are densely populated, most of the land is sparsely populated. The factors split into physical (the natural environment) and human (people's decisions). The skill examiners test is reading a choropleth map or bar/line graph of density, then describing the pattern and explaining it with these factors.
What makes population dense or sparse
| Factor | Encourages dense settlement | Leads to sparse settlement |
|---|---|---|
| Climate | Mild, reliable rainfall (temperate, monsoon) | Too hot/dry (deserts), too cold (poles), too wet |
| Relief (land shape) | Flat, low-lying land — easy to build and farm | Steep mountains, high altitude |
| Water | Rivers, deltas, coasts — water + trade routes | Arid interiors far from water |
| Soils | Deep, fertile soils (floodplains, volcanic) | Thin, infertile or frozen soils |
| Economy & history | Cities, ports, industry, jobs; long-settled cores | Few jobs; remote, recently settled frontiers |
Tip: For a map/graph question, describe the pattern first — name the highest and lowest areas, quote a figure with units (people/km²), and note any clustering (e.g. along coasts/rivers). Then explain it with one physical and one human factor.
📈 1.1.2 — Development, fertility & the demographic dividend
As a country develops economically, its birth and death rates fall — the demographic transition. The age structure shifts from a wide-based pyramid (many children) to a more column-shaped one (an ageing population).
The demographic transition — population and development
| Stage | Birth & death rates | What's happening |
|---|---|---|
| Early (low development) | Both high → slow growth | Subsistence economy; children are labour + security |
| Expanding (developing) | Death rate falls, birth rate still high → rapid growth | Better health, food, water; population booms |
| Maturing (middle-income) | Birth rate falls to meet low death rate | Education, urbanisation, women working, family planning |
| Low (developed) | Both low → slow/declining, ageing | Fertility below replacement; dependency rises |
Key terms to use precisely
- Population density — people per km² (how crowded an area is).
- Distribution — where people are spread across an area (the pattern).
- Total fertility rate (TFR) — average births per woman; 2.1 is replacement level.
- Demographic dividend — the growth boost when a large working-age share supports few dependants.
- Dependency ratio — the non-working (young + old) compared with the working-age population.
When the bulge of a fast-grown population reaches working age while birth rates have already fallen, a country has many workers and few dependants for a few decades. Invested well (jobs, education, health), this powers rapid economic growth — but the window closes as that bulge later ages.
✍️ IB-style questions
Explain two physical factors that lead to an uneven distribution of population within a country.
🔒 Model answer plan
See the mark-by-mark plan — for / against / judgement, with marking guidance — in study mode.
Examine the view that a rising level of economic development always reduces a country's fertility rate.
🔒 Model answer plan
See the mark-by-mark plan — for / against / judgement, with marking guidance — in study mode.
✅ Quick self-check
Tap each card to reveal the answer.
Difference between population density and distribution? Density = people per km² (how crowded); distribution = the pattern of where they live across an area.
Name one physical and one human factor for dense population. Physical: flat, fertile, well-watered land (e.g. a river delta). Human: cities and industry offering jobs.
What is the replacement-level fertility rate? About 2.1 births per woman — below this, a population eventually shrinks without migration.
What is the demographic dividend? A growth boost when a large working-age population supports few dependants — a temporary window that closes as that group ages.
Why does development tend to lower fertility? Female education and paid work, urban living and child survival raise the cost of large families and let people choose fewer children.
🎯 Highest-yield exam reminders
Exam Tips
- For a population map/graph: DESCRIBE first (highest, lowest, a figure with units, any clustering), THEN explain with one physical + one human factor.
- Keep density (people/km²) and distribution (the pattern) separate — examiners penalise mixing them.
- Link development to fertility through FEMALE EDUCATION and women in work — the single strongest driver of falling birth rates.
- Replacement-level fertility ≈ 2.1. Below it, a population ages and can decline without migration.
- The demographic dividend is a TEMPORARY window — many workers, few dependants — that only pays off if jobs, education and health are in place.
- On the [10] Examine/Evaluate, always weigh a counter (culture, policy, time-lag) and finish with a clear judgement.