Hi Tara. Topic 7 is the smallest topic on the 0680 syllabus — three sub-topics, and one of them has only two objectives. Do not let that fool you into skimming it, because of the three, two are skills rather than facts. Interpreting a population pyramid and comparing the structure of two countries are things you either can do or cannot, and no amount of reading a list will get you there. So this guide is short on prose and long on drilling those two.
That matters more than usual because of how the papers are weighted. Paper 2 is 40% AO3 — investigation skills and making judgements — and its questions are built on source material you have never seen: a pyramid for an unnamed country, a table of birth rates, a map of settlement. Population data is one of the easiest things to put in front of a candidate, which makes this small topic a large share of the marks you can actually control.
Two warnings before you start. First, density and distribution are not the same question, and a question that asks for one will not accept the other. Second, 7.3 is about policy, and Cambridge is politically neutral. Population policies and migration controls are things governments do, with stated aims, measurable effects, real costs and serious objections. Your job in the exam is to lay those out and weigh them — not to approve of them or condemn them. An answer that argues one way only is a half answer, whichever way it argues.
Density and Distribution — Two Different Questions
These two words are used loosely in ordinary speech and precisely in the exam, and mixing them up is the commonest way to lose an easy mark in Topic 7. Learn both definitions in the syllabus’s own words:
Population density is the number of people living in an area, usually measured in people per km².
Population distribution is how people are spread over an area.
Density is a number you calculate. Distribution is a pattern you describe. That single sentence is worth having ready, because it tells you what kind of answer each word is asking for.
The syllabus also gives you the plain-English version, and it is worth a mark: sparsely populated places contain few people, and densely populated places contain many people. “Sparse” and “dense” are the words to use when describing a map.
Here is why the two ideas have to be kept apart. Two countries can have exactly the same population density and look nothing alike, because density is an average over the whole area and an average hides everything interesting. The figure below has a national density of 83.3 people per km² — and not one square in it is anywhere near that number.
If a question gives you a national density and asks whether it tells you where people live, the answer is no, and the reason is in the figure above: every square in that country is either far below the average or far above it. The average describes no actual place. That is a genuinely useful point in an AO3 question about the limitations of a data set, and it applies to almost any average you are given.
Reading a Population Pyramid
A population pyramid is one chart carrying three separate pieces of information, and the exam can ask about any of them. Before you interpret anything, spend ten seconds on the axes, because pyramids are drawn in several different ways and the one in front of you may not be the one you practised on.
| Part of the chart | What it shows | Check this first |
|---|---|---|
| The vertical axis | age, in five-year bands, youngest at the bottom | which band is at the bottom, and how wide the bands are |
| The horizontal axis | the size of each band | whether it is a percentage of the population or a number of people — you cannot compare two countries’ percentages with one country’s millions |
| Left and right | male on the left, female on the right | read the labels; the convention is usual but not universal, and the marks go to whoever read the chart rather than remembering a habit |
The syllabus names three things you must be able to describe from the chart:
| Group | Which bars | What it means |
|---|---|---|
| Young dependent population | the bands below 15 — 0–4, 5–9, 10–14 | too young to work; they depend on the working population, and they need schools, healthcare and food |
| Working population | the bands from 15 to 64 | the people of working age, whose work supports both dependent groups |
| Elderly dependent population | the bands 65 and over | past working age; they depend on the working population, and they need pensions and healthcare |
| Female and male population | right-hand and left-hand bars | compare the two sides at the same age: in most countries the female side is longer in the oldest bands, because women tend to live longer |
Students write “a high dependent population” and stop, and the examiner cannot tell which end of the chart they mean — and the two ends have completely different consequences. A large young dependent population means demand for schools and, in twenty years, a large working population. A large elderly dependent population means demand for pensions and healthcare, and a working population that will shrink. Always say which.
How the World Bank Groups Economies
To compare countries you need a way of grouping them, and the syllabus uses the World Bank’s. It sorts economies by income per person into three groups you should know by name and abbreviation:
| Group | Abbreviation | What it means |
|---|---|---|
| Low-income countries | LICs | the lowest income per person of the three groups |
| Middle-income countries | MICs | between the other two; this is the largest group and it covers a very wide range |
| High-income countries | HICs | the highest income per person of the three groups |
Two things are worth knowing about this classification. It is based on income, not on population, area or anything else — a country can be large and populous and still be an LIC. And the income boundaries between the groups are reviewed and changed from year to year, so learn the names and what they measure rather than a threshold figure. Countries move between groups as their economies change, which is why the same country can be described differently in two sources printed a decade apart.
7.1.4 — Comparing an LIC and an HIC
This is the objective most likely to appear as an extended-response question, and it has a reliable structure. Work down the pyramid in the same order for both countries: base, middle, top, then the two sides. Use the figures from the diagram above.
| Feature | Country A (LIC) | Country B (HIC) | Why |
|---|---|---|---|
| Shape | wide base tapering steeply — a true pyramid | narrow base, nearly vertical sides, wide top — more like a column | the shape is a summary of everything below it |
| Young dependent (0–14) | 41.0% of the population | 15.6% of the population | higher birth rate: more children per woman |
| Working population (15–64) | 56.2% | 67.2% | in Country B the large mid-life bands are the generation born when birth rates were higher |
| Elderly dependent (65+) | 2.8% | 17.2% | higher life expectancy: better healthcare, nutrition, sanitation and water supply |
| Taper up the chart | steep — each band is noticeably smaller than the one below | gentle — bands stay a similar width until about 65 | a steep taper indicates a higher death rate at each age |
| Male and female | similar widths at nearly every age | the female side is longer in the oldest bands | women tend to live longer, and this shows most where many people reach old age |
A comparison question is marked on comparative statements. “Country A has a wide base. Country B has a narrow base.” is two descriptions sitting next to each other and it is worth less than “Country A has a much wider base than Country B, at 41.0% aged under 15 compared with 15.6%.” Use comparative words — wider, higher, more, fewer, than — and quote both figures. Every figure you lift off the chart is a mark you did not have to remember.
The syllabus asks you to describe young dependent, elderly dependent, working, female and male populations. Some textbooks go on to calculate a dependency ratio; you are not required to, so percentages read off the chart are enough.
What Changes the Size of a Population
Only three things can change the number of people in a place: people are born, people die, and people move. The syllabus splits that last one into general migration, the specific case of rural to urban migration, and the pattern that results, urbanisation. Learn all five as separate items, because a question that asks for “factors affecting population change” wants distinct factors, not the same one three times.
| Factor | How the syllabus measures it | What raises or lowers it |
|---|---|---|
| (a) Birth rates | children per woman | falls with better access to education and to contraception, with more women in paid work, and where children are less likely to be needed to work or to support parents in old age |
| (b) Death rates | life expectancy | rises with better healthcare, nutrition, clean water supply and sanitation. A falling death rate makes a population grow even if the birth rate does not change at all |
| (c) Migration | emigration and immigration, driven by push and pull factors | changes the population of both places at once: one loses people, the other gains them. It does not change the world total |
| (d) Rural to urban migration | movement from the countryside into towns and cities | the specific kind of migration that produces most of the impacts in 7.2.2 |
| (e) Urbanisation | the increasing proportion of a population living in urban areas | caused partly by rural to urban migration and partly by growth of the people already in cities |
Emigration is exit. Immigration is in. A person emigrates from one country and immigrates to another; the same journey has both names depending on which end you are standing at. In an exam always say which country you mean: “emigration from Country X”, not just “emigration”.
Push and Pull Factors
A push factor drives people away from where they are. A pull factor attracts them to somewhere else. Most real migrations involve both, and the same thing often appears on both lists — no jobs at home is a push, jobs in the city is a pull. That is not a coincidence to be embarrassed about; it is the point, and saying it explicitly is a strong answer.
| Push factors — reasons to leave | Pull factors — reasons to go there |
|---|---|
| few jobs, or low pay, in the home area | more jobs and higher wages in the destination |
| poor healthcare, schools and services | better healthcare, schools and services |
| drought, flooding or poor harvests making farming unreliable | a more reliable income that does not depend on the weather |
| lack of clean water supply, sanitation or electricity | housing connected to water, sanitation and power |
| conflict, or an unsafe area | safety, and family or a community already established there |
Students often assume population growth must mean people are having more children. Frequently the opposite is happening: birth rates are falling while death rates fall faster, because healthcare, water supply and sanitation have improved. The population grows because more people survive. If a question gives you a birth rate that has fallen and a population that has risen, that is the answer it is looking for.
The Impacts of Population Growth
Twelve impacts again, and they are much easier to hold if you notice that they answer three different questions. Where do the extra people live? What do they need? And what do they produce that has to be dealt with?
| Question | Impact | What it means |
|---|---|---|
| Where do they live? | (a) informal urban settlements | housing built without planning permission or formal services, on land the residents do not own, usually on the edge of a city or on land nobody else wants. Often no piped water, no sewerage and no legal electricity supply |
| (b) megacities | very large cities, formed as rural to urban migration and natural growth concentrate people in one place | |
| (h) availability of land | land is finite, so housing competes with farming, industry and open space; building on farmland reduces the area available to grow food | |
| What do they need? | (c) availability of resources | more people share the same water, fuel, timber, minerals and food |
| (d) energy usage | total demand for electricity, cooking fuel and transport fuel rises | |
| (f) water supply | more households to connect, and the same rivers and aquifers to draw from | |
| (e) sanitation | toilets, sewers and treatment for far more people. Where this is not provided, waste reaches water supplies and disease spreads | |
| (i) facilities and infrastructure | schools, hospitals, clinics, roads, power lines and public transport all have to be built and staffed to keep pace | |
| What do they produce? | (g) management of waste | more household and industrial waste to collect, treat and dispose of; uncollected waste attracts pests and contaminates land and water |
| (j) pollution | the syllabus lists six kinds: air, land, light, noise, visual and water. Learn all six — a question asking for four is easy marks if you have them and awkward if you have only air and water | |
| (k) traffic congestion | more vehicles on roads that were not built for them, which also raises air pollution and noise pollution | |
| (l) changes in employment opportunities | note changes. A growing city creates jobs in construction, services and industry; it can also mean too many people competing for too few jobs, and informal work with no security |
Air, land, light, noise, visual, water. The two that get forgotten are light (street and building lighting that affects people and wildlife at night) and visual (the appearance of an area — pylons, advertising hoardings, unfinished building sites). If you can list all six you can answer any “state three types of pollution” question without thinking.
Everything in 7.3 is a policy — something a government decides to do. Cambridge is politically neutral, and the mark scheme rewards the same four things for every policy: what it is intended to do, what effect it has been observed to have, what it costs and who pays, and what objections are raised to it. It does not reward approval or disapproval.
So write “supporters argue that… critics point out that…” rather than “this is a good policy”. And when a question ends by asking for a judgement, make the judgement conditional — “this works where X is already in place, and much less well where it is not”. That is a stronger answer than a verdict, and it is also more honest, because these measures genuinely do work differently in different places.
The Five Strategies
| Strategy | What it involves | Intended effect on population size |
|---|---|---|
| (a) Access to contraception | making contraception available and affordable, together with the information needed to use it | lowers the birth rate by allowing people to choose the number and timing of their children |
| (b) Population policies | a government policy aimed at the birth rate. A pro-natalist policy encourages more births; an anti-natalist policy encourages fewer | raises or lowers the birth rate, depending on which the country has adopted. Countries with a shrinking or ageing population tend towards the first; those with rapid growth towards the second |
| (c) Access to education | schooling for all children, and particularly the continued education of girls | birth rates are consistently lower where women spend longer in education, so this lowers the birth rate over the following decades |
| (d) Access to healthcare | clinics, vaccination, maternal and child health services | works in two directions — see below. It raises life expectancy, and it is also associated with families choosing to have fewer children |
| (e) Control of migration | visas, quotas, points systems and border controls, used to influence how many people enter or leave and who they are | changes the population of a particular country. It moves people between countries and so does not change the world total |
Two Things Worth Understanding Properly
Healthcare pulls both ways, and that is not a contradiction. Better healthcare means people live longer, which by itself makes a population larger. But it also means far more children survive to adulthood — and where parents can expect their children to survive, families have historically chosen to have fewer of them. So healthcare raises the population through life expectancy and lowers it through the birth rate, on different timescales. If an exam question asks why healthcare appears in a list of strategies for managing population size, that is the answer.
Pro-natalist and anti-natalist are directions, not values. A pro-natalist policy might offer paid parental leave, subsidised childcare, tax allowances or payments per child; a country adopts one when its working population is shrinking relative to its elderly dependent population. An anti-natalist policy might fund contraception and family-planning education, run public information campaigns, or attach financial incentives to smaller families; a country adopts one when rapid growth is outpacing housing, water supply, schooling or jobs. Which direction a country chooses depends on its population structure — which is why 7.1 comes before 7.3.
Pro-natalist = pro-birth = encourages more children. Anti-natalist = against more births = encourages fewer. “Natal” is to do with birth, as in prenatal. Getting these two the wrong way round turns a correct answer into a wrong one, so check the prefix before you write.
7.3.2 — Discussing Benefits and Limitations
This is the objective the extended-response question comes from. Both columns below are real; neither is a token sentence to balance the other.
| Strategy | Benefits | Limitations and objections |
|---|---|---|
| Access to contraception | relatively cheap per person; acts within a few years rather than decades; allows people to choose their own family size, which is a benefit to individuals independently of any national target; reduces the number of unplanned pregnancies | needs a supply chain, clinics and trained staff to reach rural areas; take-up depends on information and on cultural and religious views that a government cannot and in many cases should not override; and availability alone changes little unless people also want smaller families |
| Population policies (pro-natalist) | can slow the ageing of a population, supporting the working population that funds pensions and healthcare; the measures used — parental leave, childcare, child payments — benefit families whatever their effect on the birth rate | expensive, and the evidence is that incentives raise birth rates modestly at best; any effect on the working population arrives about twenty years later; and critics argue that money spent this way could raise the working population sooner through training or migration |
| Population policies (anti-natalist) | can slow growth that is outpacing housing, water supply, sanitation and jobs, giving a government time to build the infrastructure in 7.2.2; information campaigns and family planning are inexpensive compared with building cities | the strongest objection is one of individual rights: family size is a personal matter, and policies that go beyond information and provision into pressure or penalty are contested for that reason. Restrictive versions have also had unintended demographic effects, including rapid ageing and imbalanced sex ratios where sons were preferred, and those effects last for generations |
| Access to education | the effect on birth rates is well established and persistent, and it is achieved by expanding opportunity rather than by restricting choice; the same schooling raises incomes, health and employment, so the benefits are broad | expensive to provide universally, needs teachers and buildings, and the effect on the birth rate appears a generation later, so it does nothing about a shortage of housing or water this decade |
| Access to healthcare | raises life expectancy and reduces child mortality, which is a benefit in its own right and also one of the conditions under which families choose to have fewer children | costly to build and staff; raises life expectancy immediately and lowers the birth rate only later, so a population can grow faster in the short term before it slows; and an ageing population brings its own demand for pensions and long-term care |
| Control of migration | lets a government plan housing, schools and services against a predictable number; can be used to fill specific skills shortages; can relieve pressure on infrastructure in the receiving area | the receiving country may then face labour shortages, particularly in care and agriculture, and its own ageing population is not addressed; enforcement and administration are costly; the country people leave loses working-age adults it has already educated; and controls raise questions about obligations to people moving to escape conflict or disaster. It also does not change the world population at all — it redistributes it |