📈 Characteristics of Countries at Different Levels of Development
Population Growth & Structure
Population growth rate is the percentage change in a country’s population over a year.
Formula: Growth Rate = [(Populationt – Populationt‑1)/Populationt‑1] × 100
Think of it as a garden: if you plant 100 seeds (population) and 5 new seeds sprout each year (births) while 2 seeds die, the garden grows by 3%.
Birth Rate & Causes of Change
- Higher in low‑income countries due to limited access to contraception and higher child mortality.
- Lower in high‑income countries because families often choose fewer children and have better access to family‑planning services.
- Government policies (e.g., China’s one‑child policy) can drastically reduce birth rates.
- Social changes: urbanisation, education, especially women’s education, shift family size preferences.
Death Rate & Causes of Change
- Higher in low‑income countries due to infectious diseases, malnutrition, and limited healthcare.
- Lower in high‑income countries because of advanced medical technology and better living conditions.
- Infant mortality (death before age 1) is a key indicator of overall health and is usually highest in developing nations.
- Improved sanitation, vaccination programmes, and clean water reduce death rates over time.
Infant Mortality
Infant mortality rate (IMR) = (Number of infant deaths / Live births) × 1,000
| Country | IMR (per 1,000 live births) |
|---|
| Nigeria | 73 |
| Japan | 2 |
Net Migration
Net migration = Immigrants – Emigrants
Countries with high economic opportunities (e.g., USA, Germany) attract many immigrants, leading to a positive net migration. Conversely, countries facing conflict or economic hardship may experience negative net migration.
✏️ Examination Tips
- Remember the demographic transition model: as a country develops, birth and death rates fall, leading to slower population growth.
- Use the population pyramid to visualise age structure: wide base = high birth rate, tall top = high life expectancy.
- When answering “What causes changes in birth rate?” list access to contraception, women’s education, urbanisation, and cultural norms.
- For “Explain the impact of infant mortality on population growth,” note that high infant mortality reduces the number of children who survive to adulthood, slowing growth.
- Practice converting raw numbers into rates (e.g., (5,000 births / 100,000 population) × 1,000 = 50 ‰).
Analogies & Examples
- Population as a river: Births add water, deaths subtract water. Net migration is like water flowing in or out of the river.
- Infant mortality as a filter: A high filter (high infant mortality) removes many young “particles” before they can contribute to the population.
- Economic development as a garden’s fertilizer: Fertilizer (better healthcare, education) reduces the “weeds” (high death rates) and encourages healthy growth (lower birth rates).