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Measuring Development — Single and Composite Indicators
IB DP Economics — Unit 4: The Global Economy | SL | 4.8 Measuring Development
📋 What You Will Learn
- Identify and define key single indicators of development: GDP per capita, GNI per capita, literacy rate, life expectancy, infant mortality rate, and access to healthcare
- Explain the limitations of using single indicators to measure development
- Analyse the Human Development Index (HDI) as a composite indicator, including its three dimensions and how it is calculated
- Evaluate the strengths and weaknesses of the HDI compared to single indicators
- Apply development indicators to compare countries at different stages of development using real-world data
- Evaluate the suitability of different indicators for measuring development, including the Happy Planet Index (HPI) and the Inequality-adjusted HDI (IHDI)
🔍 Guiding Question Can a single number ever capture what it means for a country to be "developed" — and if not, what are the consequences of using the wrong measure?
🌍 Why This Matters In 2023, Qatar had a GDP per capita of over $83,000 — higher than Germany or Japan — yet ranked 42nd on the Human Development Index, below countries with far lower incomes. Meanwhile, Cuba, with a GDP per capita under $9,000, consistently achieves life expectancy and literacy rates comparable to high-income nations. The numbers we choose to measure development shape the policies we design, the aid we allocate, and the countries we consider "successful."
What Is Economic Development?
Economic growth — a rise in real GDP — is not the same as economic development. Growth is a necessary but insufficient condition for development. Development is a broader, multidimensional concept.
📖 Definition — Economic Development Economic development refers to a sustained increase in the economic well-being and quality of life of a population, encompassing improvements in living standards, health, education, freedom, and equality — not merely an increase in national income.
📖 Definition — Economic Growth Economic growth is an increase in a country's real GDP (or real GDP per capita) over time, representing an expansion in the productive capacity of an economy.
- Growth can occur without development: a country may increase GDP through oil revenues while most citizens remain in poverty (e.g. equatorial Guinea)
- Development implies structural change: improvements in health, education, gender equality, political freedom, and environmental sustainability
- Measuring development requires indicators — statistical measures that capture different dimensions of well-being
- Indicators are divided into single indicators (one variable) and composite indicators (multiple variables combined into one index)
Single Indicators of Development
A single indicator uses one variable to represent the level of development. Each captures something real and important — but none captures everything. Understanding what each measures, and what it misses, is essential for exam analysis.
1. GDP per Capita and GNI per Capita
📖 Definition — GDP per Capita Gross Domestic Product (GDP) per capita is the total market value of all final goods and services produced within a country's borders in a given year, divided by the population. It is the most widely used single indicator of average income and living standards.
📖 Definition — GNI per Capita Gross National Income (GNI) per capita measures the total income earned by a country's residents (including income from abroad), divided by the population. It differs from GDP by including net factor income from abroad (e.g. remittances, profits from overseas investments).
💡 GDP vs GNI — Why the Difference Matters For countries with large numbers of citizens working abroad (e.g. Philippines, Nepal, Mexico), GNI per capita exceeds GDP per capita