Development is broader than growth and requires multiple indicators.
Must know
- HDI combines health education and income.
- GNI per head differs from GDP per head.
- Composite indices conceal some distributional differences.
Must know definitions
Human Development Index (HDI): a composite index combining education, health and income indicators to measure a country's level of human development, scored between 0 and 1.
Purchasing power parity (PPP): an adjustment to income figures that accounts for differences in the cost of living and price levels between countries, allowing more meaningful comparisons of real purchasing power.
Real GNI per capita: a country's gross national income (GDP plus net income from abroad) divided by population, adjusted for inflation.
Explain and apply
Mechanism in brief: Higher income can finance nutrition, healthcare and schooling, but access and public provision determine whether those resources improve outcomes. Component indicators reveal weaknesses hidden by a composite average.
Distinguish: HDI is not an income-only measure; an average does not describe every household.
Use the extract: Read HDI components and income measures together; identify the weakest dimension and inequalities hidden by averages.
The three components of the Human Development Index (HDI); how they are measured
The Human Development Index (HDI) is a composite measure of development combining three equally-weighted components:
- Education — mean years of schooling for adults; expected years of schooling for a child starting school.
- Health — life expectancy at birth.
- Income — real GNI per head at purchasing power parity (PPP).
- Each component is scored between 0 and 1, and the three are combined into a single index (also 0 to 1) — closer to 1 means a higher level of development.
- Real GNI per head measures income accruing to residents, including net primary income from abroad. It does not simply add all remittances or foreign aid to GDP: personal transfers and most current aid belong to secondary income and affect disposable income rather than GNI directly.
- PPP adjustment converts this income figure using the actual purchasing power of the local currency rather than the market exchange rate, allowing meaningful comparison across countries with different price levels.
income ↑ + life expectancy ↑ + years of schooling ↑ → HDI ↑ → higher ranked level of human development
Advantages and limitations of the HDI in comparing living standards between countries and over time
| Advantages | Limitations |
|---|---|
| Combines income with health and education, giving a broader picture of living standards than GDP/GNI alone | An average/composite score — does not reveal how income, health or education are distributed within a country, so can mask inequality |
| Allows comparison of development across countries and over time using a single index | Does not measure poverty directly |
| Reflects the success of government policy in health and education spending, not just economic growth | Excludes political freedom, human rights, gender equality, cultural identity and environmental quality |
| More widely regarded than GDP/GNI alone as a measure of genuine development | Equal weighting of the three components is a value judgement — not all economists agree health, education and income should count equally |
A common slip in exams: the HDI is a composite average, so a rising national HDI does not mean living standards have improved for everyone — it can rise even while inequality within the country widens.
Other measures of development
Beyond the HDI, several other indicators are used to assess a country's level of development, especially where more disaggregated or sector-specific data is useful:
- Percentage of adult male labour employed in agriculture — a high share is typically associated with lower development, since agriculture tends to have low productivity in developing economies.
- Access to clean water.
- Energy consumption per capita.
- Access to the internet per thousand of population.
- Access to mobile phones per thousand of population.
- Access to doctors per thousand of population.
- No single one of these indicators should be treated as a full measure of development on its own — each captures only one dimension.
- Economists combine income measures such as GNI, composite indices such as HDI, and non-income indicators to build a fuller picture.
Compare countries using consistent measures and inspect the components. Similar HDI scores can reflect different strengths, while averages conceal inequality; use complementary evidence for the development claim being made.
Rapid recap
Development includes health, education and living standards. HDI combines these dimensions; GDP or GNI alone cannot measure their distribution or every aspect of wellbeing.
Diagram cue: compare component indicators; no diagram is required.
Related chapters: Unit 2 chapter 1 · Unit 4 chapter 9 (p. 45)