Demographic gap
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Demographic gap in demographic cycle spm
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Here is a full explanation of the Demographic Gap as covered in the Demographic Transition Model (Population Cycle) for SPM Geography:
Demographic Gap in the Demographic Transition Cycle
What is the Demographic Gap?
The demographic gap is the difference (gap) between the birth rate and the death rate at any point in the demographic transition cycle. It directly determines whether a population is growing, stable, or shrinking.
- Wide gap (birth rate >> death rate) = rapid population growth
- Narrow gap = slow population growth
- No gap (rates equal) = stable population
- Negative gap (death rate > birth rate) = population decline
The 5 Stages of the Demographic Transition Model
| Stage | Birth Rate | Death Rate | Demographic Gap | Population Trend |
|---|---|---|---|---|
| Stage 1 (Pre-industrial) | High | High | Small / No gap | Low & stable |
| Stage 2 (Early developing) | High | Falls rapidly | Very wide gap | Rapid growth (population explosion) |
| Stage 3 (Late developing) | Begins to fall | Low | Narrowing gap | Growth slowing |
| Stage 4 (Developed) | Low | Low | Very small gap | High but stable |
| Stage 5 (Post-industrial) | Falls below death rate | Low | Negative gap | Declining population |
Stage-by-Stage Explanation
Stage 1 - High Stationary
- Both birth rate and death rate are very high (~35-40 per 1,000)
- Gap is small, so population stays low and stable
- Reasons: no healthcare, disease, famine, war
Stage 2 - Early Expanding (The Critical Stage)
- Death rate drops sharply due to improved medicine, sanitation, food supply
- Birth rate stays high (cultural habits, religion, need for farm labour)
- This creates the widest demographic gap
- Result: population explosion - this is the key moment in SPM questions
- Example: Many African and South/Southeast Asian countries
Stage 3 - Late Expanding
- Birth rate starts to fall (urbanisation, women's education, contraception)
- Death rate remains low
- Gap narrows but population still grows
- Example: India, parts of Southeast Asia
Stage 4 - Low Stationary
- Both rates are low (~10-15 per 1,000)
- Gap is very small or zero
- Population is large but stable
- Example: UK, USA, Germany
Stage 5 - Declining
- Birth rate falls below death rate
- Gap becomes negative
- Population shrinks and ages
- Example: Japan, some European countries
Why the Demographic Gap Matters (SPM Focus)
- Population growth rate is determined by the size of the demographic gap
- A large gap in Stage 2 leads to overpopulation problems - strain on food, housing, jobs, schools
- A negative gap in Stage 5 leads to underpopulation problems - ageing population, labour shortages, pension crisis
- Governments use knowledge of the gap to plan population policies (pro-natalist or anti-natalist)
Key Formula to Remember
Natural Increase Rate = Birth Rate - Death Rate The demographic gap IS the natural increase rate expressed visually on the model.
Exam tip for SPM: When asked to explain the demographic gap, always state which stage you are referring to, name the rates, explain why they differ at that stage, and describe the resulting population change.
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