Competitive markets tend to eliminate economic discrimination, but there are many historical examples of firms that hired few, or no, black or female workers

Which of the following is not a reason for the persistence of this form of discrimination?
A) Some white consumers were unwilling to buy from companies that employed black workers.
B) If discrimination makes it difficult for a member of a group to be hired in a particular occupation, there is less incentive for members of the group to be trained to enter that occupation.
C) Laws passed by the federal government made it more expensive to hire black or female workers. As a result, it was less expensive for employers to hire mostly white male workers.
D) In many cases, white workers refused to work with black workers.

C