Which of the following is true about price discrimination?
a. When there are a number of competing firms, price discrimination is less likely because competitors tend to undercut the high prices charged those discriminated against.
b. A profit-maximizing seller will charge a higher price for those with a greater willingness to pay, and a lower price for demanders with a lower willingness to

pay.
c. Price differentials between groups will erode if reselling is easy.
d. All of the above are true of price discrimination.

d