Gini Coefficient
Quick Definition
A statistical measure of income or wealth inequality within a population, ranging from 0 (perfect equality) to 1 (maximum inequality).
Key Takeaways
- Ranges from 0 (perfect equality) to 1 (maximum inequality)
- Derived from the Lorenz curve of cumulative income distribution
- Most developed nations fall between 0.25 and 0.40
- Used to evaluate tax policy, social programs, and economic development
What Is Gini Coefficient?
The Gini coefficient (or Gini index) quantifies the distribution of income or wealth across a population on a scale from 0 to 1 (or 0 to 100). A coefficient of 0 represents perfect equality where everyone earns the same, while 1 represents maximum inequality where one person holds all income. Developed by Italian statistician Corrado Gini in 1912, it is derived from the Lorenz curve, which plots cumulative income share against cumulative population share. Most developed nations have Gini coefficients between 0.25 and 0.40 for income. The Gini coefficient is used by economists, governments, and international organizations like the World Bank to track inequality trends and evaluate the impact of tax and social policies.
Gini Coefficient Example
- 1Scandinavian countries have Gini coefficients around 0.25-0.28, reflecting relatively equal income distribution.
- 2The U.S. Gini coefficient of approximately 0.39 is among the highest in developed nations.
- 3South Africa has one of the world's highest Gini coefficients at around 0.63, reflecting extreme wealth inequality.
Related Terms
GDP Per Capita
A country's total economic output divided by its population, used as a measure of average living standards.
Economic Growth
The increase in the production of goods and services in an economy over time, typically measured by the growth rate of real GDP.
Fiscal Policy
Government decisions about taxation and spending used to influence economic conditions and achieve macroeconomic goals.
Wage Growth
The rate of increase in worker compensation over time, a key indicator of labor market strength and potential inflationary pressure.
Purchasing Power Parity (PPP)
An economic theory that compares currencies based on how much a standardized basket of goods costs in each country.
GDP (Gross Domestic Product)
The total monetary value of all finished goods and services produced within a country's borders in a specific time period.
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