Labor Economics 5th Edition by George Borjas

Exercise 22

Consider an economy with the following income distribution: each person in the bottom quartile of the income distribution earns $15,000; each person in the middle two quartiles earns $40,000; and each person in the top quartile of the income distribution earns $100,000.
(a) What is the Gini coefficient associated with this income distribution
(b) Suppose the bottom quartile pays no taxes, the middle two quartiles pay 10 percent of its income in taxes, and the top quartile pays 28 percent of its income in taxes. Two-thirds of all tax money is redistributed equally to all citizens in the form of military defense, government pensions (social security), roads/highways, and so on. The remaining one-third of tax money is disturbed entirely to the poorest quartile. What is the Gini coefficient associated with this redistribution plan Would you consider this tax and redistribution plan to be a particularly aggressive income redistribution policy