Since about 1970 in the U.S.,
a. decreases in the wages of unskilled workers, relative to skilled workers, have led to increased inequality in family incomes.
b. increases in the wages of unskilled workers, relative to skilled workers, have led to increased equality in family incomes.
c. inequality in family incomes has increased, despite increases in the wages of unskilled workers relative to skilled workers.
d. inequality in family incomes has decreased, despite increases in the wages of skilled workers relative to unskilled workers.



Table 20-7
Quintile Upper limit of incomes, 2008 Upper limit of incomes, 1998
Bottom Fifth $20,712 $21,273
Second Fifth $39,000 $40,139
Middle Fifth $62,725 $63,805
Fourth Fifth $100,240 $99,000
Top Fifth over $100,240 over $99,000
86. Refer to Table 20-7. Which of the following is the best overall conclusion to draw from the data?

a. The most alarming statistic is the lowering of the top income level that defines the bottom fifth of the income distribution because this indicates that the income distribution is becoming more unequal.
b. The greatest cause for concern is the increase in the minimum income level that defines the top fifth of the income distribution because this indicates that the rich have become richer.
c. The income distribution is has been relatively unchanged from 1998 to 2008.
d. Both a) and are correct.