Relationship between the Lorenz curve and the Gini index
To understand the relationship between the Gini index and the Lorenz curve we must first know these two concepts.
To see the relationship between these two concepts, let's define them first:
- Gini index: It is a measure of inequality in the distribution of income.
- Lorenz curve: It is a graphical representation of the inequality in the distribution of income
From the above, we can conclude that the Lorenz curve is a representation and the Gini index a number. Now, what is the relationship that unites them?
Calculate the Gini index with the Lorenz curve
Through the Lorenz curve we could calculate the Gini index. If we divide the area that remains between the curve and the line of equality by the total area that remains under the curve, we will obtain our coefficient as a percentage of 1 (multiplied by 100 it would be in%). The formula is:
Gini = A / (A + B)
A = Area above the curve
B = Area under the curve
With which A + B gives as a result the total area of the square in which the graph is represented.
In short, both the Gini Index and the Lorenz Curve are methods to identify income inequalities in a given country or population. Therefore, we must mention that the more developed a country is, the more equity there is usually in it. That is, the Gini index is closer to 0 and the Lorenz Curve is closer to the line of perfect equality.Lorenz curve Economic inequality