Upload
richard-boone
View
216
Download
2
Tags:
Embed Size (px)
Citation preview
1Copyright © by Houghton Mifflin Company. All rights reserved.
Measuring the Income Distribution
• Describing the income distribution.
• The Lorenz Curve.
• The Gini coefficient.
• Empirical evidence on the income distribution.
2Copyright © by Houghton Mifflin Company. All rights reserved.
3Copyright © by Houghton Mifflin Company. All rights reserved.
Figure 5.1: A Graphic Illustration of the Income Distribution
4Copyright © by Houghton Mifflin Company. All rights reserved.
Gini Coefficient• The Gini Coefficient is derived by comparing the Lorenz
curve to the line of perfect equality.
• The Gini coefficient takes on a value between zero and one (inclusive). The more unequal the income distribution, the higher the value of the Gini coefficient.
• If we denote the area between the Lorenz curve and the line of perfect equality as A, the Gini coefficient is G=2A.
5Copyright © by Houghton Mifflin Company. All rights reserved.
Gini Coefficient
• Notice that if the income distribution is perfectly equal and the Lorenz curve follows the line of perfect equality, the area A=0, hence G=0. The Gini coefficient takes on the value of zero when the income distribution is equal.
• On the other hand, if the income distribution is perfectly unequal, Bill Gates has it all, the Gini coefficient is G=1.
6Copyright © by Houghton Mifflin Company. All rights reserved.
7Copyright © by Houghton Mifflin Company. All rights reserved.