It is true that unionized women earn, on average, more than a third more than non-unionized women do. But the unionized women work in industries where wages happen to be high, their non-unionized counterparts in these industries earn about as much as they do. Therefore, unionization does not raise women’s wages.
Which of the following, if true, most seriously weakens the argument above?

Question

Examsnet · Accepted Answer

Correct Answer is :  Non-unionized women in an industry often receive income increases as a result of increases won by unions representing women who work for other employers in the same industry.

GMAT Verbal Reasoning Practice Test 3