Labor Economics 5th Edition by George Borjas

Exercise 18

(a) Is the presence of an underground economy likely to result in a Gini coefficient that over-states or under-states poverty
(b) Consider a simple economy where 90 percent of citizens report an annual income of $10,000 while the remaining 10 percent report an annual income of $110,000. What is the Gini coefficient associated with this economy
(c) Suppose the poorest 90 percent of citizens actually have an income of $15,000 because each receives $5,000 of unreported income from the underground economy. What is the Gini coefficient now