Population Trends and Movements (SACE Stage 2 Geography Population Change)

What this dot point is asking

This dot point is the core of Topic 3, Population Change. The key geographical skills are reading population data, interpreting population pyramids and applying the demographic transition model. Strong answers link demographic structure to its social and economic consequences.

Explaining population trends

Natural increase is births minus deaths; net migration is arrivals minus departures. The demographic transition model describes how countries move through stages from high birth and death rates to low birth and death rates as they develop. It helps explain why some countries are still growing fast while others are shrinking.

• Rapid growth: many countries in sub-Saharan Africa, such as Niger, have high fertility and youthful populations, putting pressure on schools, jobs and food.
• Ageing and decline: Japan has one of the world's oldest populations and a shrinking workforce, with deaths exceeding births.
• Australia: growth is driven heavily by net overseas migration rather than natural increase, and the population passed 27 million in the mid-2020s.

Types of population movement

Migration is voluntary or forced and internal or international.

• International voluntary migration: skilled and family migration drives most of Australia's population growth.
• Forced migration: by the mid-2020s more than 100 million people worldwide were forcibly displaced by conflict and persecution, for example refugees from Syria and Ukraine.
• Internal migration: across Australia, people move from rural areas to cities and, more recently, from capital cities to regional areas, a trend accelerated by remote work after COVID-19.

Migration follows push factors (conflict, poverty, drought) and pull factors (jobs, safety, services).

Consequences across systems

Economically, a youthful population offers a potential "demographic dividend" of workers, but only with enough jobs and education; otherwise it brings unemployment. Ageing populations face a rising dependency ratio, where fewer workers support more retirees, straining pensions and health systems. Migration can fill labour shortages and add skills, but rapid arrival can strain housing and infrastructure, a live debate in Australian cities.

Socially, migration increases cultural diversity but can create tension if integration and services lag. Forced migration creates humanitarian crises and pressure on host countries and regions.

Strategies for managing population change

Strategies depend on the trend.

• Managing growth: family planning, education for girls and improved health care lower fertility over time, as seen in many developing nations.
• Managing ageing: raising retirement ages, encouraging migration, and pro-natal policies (Japan and parts of Europe), though pro-natal incentives have had limited success.
• Managing migration: skilled-migration programs, refugee resettlement, and regional settlement incentives that direct migrants away from crowded capitals.

Evaluation means judging trade-offs: migration can ease ageing but needs housing and services to keep up.

Linking it together

A complete response explains population trends with the demographic transition model and pyramids, distinguishes types of migration with push and pull factors, analyses consequences such as the demographic dividend and dependency ratio, and evaluates strategies using cases such as Japan, Niger and Australian migration. That structure matches the geographical skills and applications criteria the SACE Board assesses.