How and why do populations grow, age and move, and how is population measured?
Methods of population data collection, the demographic transition model, the causes and consequences of population change and structure, and the causes and consequences of migration.
An SQA Higher Geography answer on population geography, covering how census and other data are collected, the demographic transition model, the causes and consequences of changing birth and death rates and population structure, and the causes and effects of voluntary and forced migration.
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What this key area is asking
The SQA wants you to explain how population data are gathered and why this is difficult in some places, use the demographic transition model to describe how birth and death rates change as a country develops, interpret population structure from a pyramid, and explain why people migrate and what the consequences are for both source and destination. Marks come from giving reasons and consequences, not just descriptions.
Collecting population data
Other sources support the census: vital registration of births, deaths and marriages gives continuous, up-to-date figures, while sample surveys fill the gaps between censuses. In developing countries data can be incomplete because of large, scattered rural populations, nomadic groups with no fixed address, illiteracy, language differences, distrust of officials, and the high cost of organising and processing a full count.
The demographic transition model
The model is useful but has limits: it is based on the historical experience of European countries, it does not predict the speed of change, and it ignores the role of migration in altering a country's population.
Population structure
A population pyramid plots the number or percentage of males and females in each age group. A wide base and narrow top show high birth rates and a short life expectancy, typical of a developing country in Stage 2, such as Niger. A narrow base with a bulge in the older groups shows low birth rates and a long life expectancy, typical of an ageing developed country in Stage 4 or 5, such as Scotland.
Migration
Migration is usually explained with push factors (reasons to leave, such as unemployment, conflict or drought) and pull factors (reasons to move to a place, such as jobs, safety or family). The source region may lose young, skilled workers (a brain drain) but gain remittances; the destination gains labour and cultural diversity but may face pressure on housing and services.
Examples in context
Example 1. Scotland and an ageing population. Scotland sits in Stage 4 to 5 of the DTM, with low birth rates and rising life expectancy. National Records of Scotland projects that by the 2040s the over-65 share will rise sharply while the working-age share falls, lifting the dependency ratio. The consequences are higher demand for pensions, social care and healthcare, pressure on a shrinking tax base, and reliance on inward migration to fill labour gaps. This is a named developed-world case of the structure-and-consequences link.
Example 2. Poland to the United Kingdom after 2004. When Poland joined the EU in 2004, large voluntary economic migration flowed to the UK (push factors of unemployment and low wages at home, pull factors of jobs and higher pay). The source, Poland, lost young skilled workers but gained remittances; the destination, the UK, filled labour shortages in construction, agriculture and services and gained cultural diversity, while some areas felt pressure on housing and schools. This is a clear named flow showing consequences for both ends.
Try this
Q1. Explain why birth rates fall as a country moves from Stage 2 to Stage 3 of the demographic transition model. [4 marks]
- Cue. Better access to contraception and family planning; the education and employment of women; lower infant mortality so families have fewer children; the higher cost of raising children in towns.
Q2. Explain the consequences of out-migration for a source region. [3 marks]
- Cue. Loss of young, working-age and skilled people (a brain drain); an ageing population and labour shortages left behind; but also money sent home as remittances.
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SQA Higher 20186 marksExplain the difficulties of collecting accurate population data in a developing country.Show worked answer →
Worth 6 marks. The command is "explain", so each difficulty must be given with a reason why it reduces accuracy. Aim for about three developed points.
Physical and practical barriers (about 2 marks). Large, scattered rural populations live in remote areas with poor roads, so enumerators cannot reach everyone, and nomadic groups have no fixed address to record.
Social and educational barriers (about 2 marks). Widespread illiteracy means forms cannot be filled in reliably, and language differences between many ethnic groups cause confusion. Some people distrust officials and avoid being counted, or give false ages because birth records were never kept.
Cost and capacity (about 2 marks). A census is hugely expensive, and a poorer government may lack the trained staff, computers and money to organise a full count or to process the results, so figures are estimates or out of date.
SQA Higher 20226 marksReferring to named examples, explain the consequences of migration for both the source country and the destination country.Show worked answer →
Worth 6 marks. Balance the two areas, and give consequences (good and bad) with reasons. Naming a flow such as Poland to the UK or Mexico to the USA earns the example credit.
Source country (about 3 marks). It loses young, working-age and often skilled people (a brain drain), which can leave an ageing population and labour shortages. However, migrants send home remittances, which raise incomes and fund schooling and housing, and skills learned abroad may return.
Destination country (about 3 marks). It gains workers to fill labour shortages and a more diverse culture, and migrants pay taxes. But there can be added pressure on housing, schools and health services, downward pressure on some wages, and social tension. A balanced answer with a named flow reaches the top band.
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Sources & how we know this
- SQA Higher Geography Course Specification — SQA (2018)