Gini Coefficient: Measuring Income Inequality in One Number

What Is the Gini Coefficient?

The Gini coefficient (or Gini index) is a statistical measure of income or wealth distribution within a population. It was developed by Italian statistician Corrado Gini in 1912 and remains the most widely used single-number summary of inequality.

The Gini coefficient ranges from 0 to 1 (or equivalently 0 to 100 when expressed as a percentage):

• 0 (perfect equality): Every person has identical income. If the country has ₹100 of income and 10 people, each has exactly ₹10.
• 1 (perfect inequality): One person has all the income. Everyone else has zero.

Real societies sit between these extremes. A Gini coefficient of 0.30 (30) indicates moderate inequality; 0.50 (50) indicates very high inequality; 0.65+ indicates extreme concentration.

How the Gini Coefficient Is Calculated

The Gini coefficient is derived from the Lorenz curve — a graphical representation of cumulative income distribution.

Construction of the Lorenz curve:

1. Rank all individuals or households from lowest to highest income.
2. On the horizontal axis, plot the cumulative share of the population (0% to 100%).
3. On the vertical axis, plot the cumulative share of income received.

In a perfectly equal society, the Lorenz curve would be the diagonal line of equality — the bottom 10% would earn 10% of income, the bottom 50% would earn 50%, and so on.

In reality, the Lorenz curve bows below the diagonal — the bottom half of the population earns far less than 50% of total income.

The Gini coefficient = Area between the diagonal and the Lorenz curve ÷ Total area below the diagonal

The wider the gap between the diagonal and the actual Lorenz curve, the higher the Gini coefficient and the greater the inequality.

India's Gini Coefficient

India's measured Gini coefficient for consumption expenditure has historically been around 32–36 (relatively moderate by global standards). However, a critical distinction must be made:

Consumption Gini vs. Income/Wealth Gini

India's surveys primarily measure consumption (what people spend), not income or wealth. Consumption tends to be more evenly distributed than income because the poor consume a larger share of their income. India's income Gini is significantly higher — estimated at around 55–60 by researchers — and its wealth Gini is even more extreme.

A 2024 report by the World Inequality Lab found that India's top 1% held approximately 40% of national wealth and received 22.6% of national income — among the highest concentrations of wealth in the world.

The gap between consumption Gini and income/wealth Gini explains why India can simultaneously present as "moderately unequal" in official statistics and "extremely unequal" in lived experience.

Comparing India Globally

These comparisons must be interpreted carefully — different data sources and methodologies produce different results. But the broad picture for India suggests income inequality is substantially higher than consumption inequality data alone would imply.

What Drives Inequality in India?

Urban-Rural Income Gap

Agricultural incomes are significantly lower than urban professional and formal sector incomes. As India's services and manufacturing sectors grow faster than agriculture, the income gap between urban and rural households has widened.

Education Returns

Returns to education are high in India — a college degree (especially from a premier institution) offers dramatically higher lifetime earnings than no degree or a lower-quality education. Unequal access to quality education is a primary driver and perpetuator of income inequality.

Capital and Labour Income

Returns on capital (stocks, property, business profits) have outpaced labour income growth in India over recent decades. Since capital ownership is concentrated, rising asset prices disproportionately benefit the wealthy. This is the "Piketty problem" — when the return on capital consistently exceeds economic growth, inequality tends to rise.

Informality

The vast majority of India's workforce is in the informal economy, without employment protections, minimum wage enforcement, or social security. The gap between formal and informal workers' earnings is a major structural driver of inequality.

Gender Gap

India's gender pay gap and low female labour force participation mean that women's incomes are systematically lower than men's across virtually every sector and region, contributing to household-level inequality.

Why Inequality Matters for the Economy

High inequality is not just a moral concern — it has economic consequences:

1. Reduced aggregate demand: When income concentrates at the top (where the marginal propensity to consume is low), overall consumer spending grows more slowly. This limits market size for consumer goods businesses and can constrain growth.

2. Reduced social mobility: High inequality tends to perpetuate itself. Children born into low-income households have less access to quality education, healthcare, and networks, limiting their ability to rise. This reduces the talent pool available to the economy.

3. Political instability: Extreme inequality can fuel political polarisation and social unrest, creating an uncertain environment for investment.

4. Health and education outcomes: Higher inequality correlates with worse average health and education outcomes, reducing human capital quality over time.

5. Financial exclusion: Large segments of the population without income or assets cannot access formal credit, insurance, or investment — limiting their ability to smooth consumption and build wealth.

Policy Responses in India

India has historically used several tools to address inequality:

• Progressive taxation: Higher income tax rates on larger incomes (though the effective rate is lower than statutory due to exemptions)
• Direct benefit transfers (DBT): Direct cash transfers to beneficiaries using Aadhaar-linked accounts, bypassing intermediaries
• MGNREGA: Rural employment guarantee providing a minimum income floor
• Subsidised essential goods: Food through the PDS, LPG subsidies, free health cover under Ayushman Bharat
• Education investment: IITs, IIMs, and scholarships for lower-income students, though access to quality schooling remains unequal

The debate is whether these tools are sufficient given the scale of wealth concentration. Critics argue India needs stronger capital gains taxation, inheritance taxes, and more progressive property taxes to address wealth inequality specifically.

Key Takeaways

1. The Gini coefficient measures income or wealth inequality on a 0–1 scale: 0 is perfect equality, 1 is perfect inequality.
2. India's consumption Gini (~33) understates true inequality; income and wealth Gini are significantly higher (~55–60 for income).
3. India's top 1% holds a disproportionately large share of national income and wealth — among the highest in the world.
4. Key drivers include the urban-rural gap, education disparities, capital vs. labour income, informality, and gender inequality.
5. High inequality has real economic costs: reduced aggregate demand, lower social mobility, and weakened human capital accumulation.

Use the Budget Calculator to assess your own household's position relative to income benchmarks — and to plan a financial trajectory that builds wealth systematically.