Population Pyramids & Demographic Transition — GCSE Geography Revision

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What is Population Pyramids & Demographic Transition?

Population pyramids are graphs that show the age and sex structure of a population. The shape of a pyramid can reveal a lot about a country's development, birth and death rates, and life expectancy. The Demographic Transition Model (DTM) describes how these population characteristics change over time as a country develops, typically moving from high birth and death rates (Stage 1) to low birth and death rates (Stages 4 and 5).

Board notes: Population pyramids and the DTM are fundamental concepts in all GCSE Geography specifications (AQA, Edexcel, OCR). Students must be able to describe, interpret, and compare pyramids for countries at different stages of development and link them to the DTM.

Worked example

Common mistakes

• 1Reading a population pyramid incorrectly. The left side always shows males and the right side shows females. The horizontal axis shows the number or percentage of the population, and the vertical axis shows age groups (cohorts).
• 2Thinking the DTM is a perfect predictor of the future. It's a model based on the experience of European countries. The speed of transition and the factors driving it can be very different for today's developing countries.
• 3Confusing natural increase with population growth. Natural increase is just births minus deaths. Overall population growth also includes the impact of migration, which can be significant.

Population Pyramids & Demographic Transition exam questions

Exam-style questions for Population Pyramids & Demographic Transition with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel and OCR specifications.

Frequently asked questions

• What do the different stages of the Demographic Transition Model show?

  Stage 1: High birth and death rates, low total population. Stage 2: Death rate falls, birth rate remains high, rapid population growth. Stage 3: Birth rate starts to fall, population growth slows. Stage 4: Low birth and death rates, stable population. Stage 5: Death rate exceeds birth rate, population starts to decline.

• What is an ageing population?

  An ageing population is one where the proportion of older people (typically over 65) is increasing. This is characteristic of HICs in Stages 4 and 5 of the DTM and creates economic challenges as there are fewer working-age people to support the growing number of retirees.