Definitions and Factors of Development

Because economic data can be misleading, economists apply Purchasing Power Parity (PPP) to account for differences in the cost of living between countries. Furthermore, to measure how wealth is distributed, geographers use the Gini Coefficient. This is a scale from $0$ to $1$ (or $0$ to $100$), where $0$ represents perfect equality and $1$ represents perfect inequality.

The Human Development Index (HDI)

To solve the problem of economic averages hiding poor social conditions, the United Nations created the Human Development Index (HDI). This is a composite measure that combines three different dimensions to give a score between $0$ and $1$:

• Health: Measured by life expectancy at birth.
• Education: Measured by mean years of schooling for adults and expected years of schooling for children.
• Standard of Living: Measured by GNI per capita (adjusted for PPP).

Edexcel classifies countries into three distinct categories based on their HDI score boundaries:

• Developing (Low Human Development): Scores of $0.0 - 0.54$ (e.g., Niger $\approx 0.394$).
• Emerging (Medium/High Human Development): Scores of $0.55 - 0.799$ (e.g., India $\approx 0.586$, Brazil $\approx 0.744$).
• Developed (Very High Human Development): Scores of $0.8 - 1.0$ (e.g., UK $\approx 0.94$).

Political Indicators: The CPI

When government officials take bribes, ordinary citizens pay the price. The Corruption Perceptions Index (CPI) is published annually by Transparency International and ranks countries by their perceived levels of public sector corruption on a scale of $0$ (highly corrupt) to $100$ (very clean).

High corruption acts as a massive barrier to development. Funds intended for public health and education are diverted to individuals, lowering the overall standard of living. Furthermore, high corruption discourages Foreign Direct Investment (FDI) because foreign businesses find it too risky and expensive to operate there.

How Food and Water Security Drive Development

It is impossible to build a strong economy if the workforce is constantly sick or hungry. Access to food security and water security provides the foundation for all human development.

Water stress occurs when the annual supply per person falls below $1,700\text{ m}^3$, and water scarcity occurs below $1,000\text{ m}^3$. This can be physical water scarcity (demand exceeds physical supply, like in the Sahel) or economic water scarcity (water exists, but the country lacks the infrastructure to distribute it). Agriculture consumes $70\%$ of global water, meaning water shortages directly threaten food supplies.

The causal mechanism between resources and development works like this:

• Water and Education: In developing nations, children (often girls) spend hours daily fetching water. This 'time poverty' causes them to miss school, directly lowering the country's "expected years of schooling" (an HDI component).
• Food and Productivity: A lack of calories (men require $\approx 2,500$ daily, women $\approx 2,000$) leads to malnutrition. This causes stunted cognitive and physical growth. A malnourished workforce has higher absenteeism and lower stamina, which reduces national output (GDP).
• Disease and Demographic Drag: Poor water sanitation causes waterborne diseases like cholera. A high infant mortality rate triggers a replacement effect where families have more children. This increases the dependency ratio, draining economic resources.

Conversely, strong food and water security triggers a positive 'Cycle of Wealth'. Healthy workers generate tax revenue, which is reinvested into social infrastructure, creating a productive workforce that attracts FDI and drives further economic growth.