O A. firms charge a higher price to customers whose demand is less elastic and a lower price to consumers whose demand is more elastic OB. firms charge a higher price for a product when it is first introduced and a lower price later. O c. firms charge each consumer a different price equal to that consumers willingness to pay. D. both a and b. E all of the above. Under what circumstances can a firm successfully practice price discrimination? To successfully practice price dincrimination O A. some consumers must have greater will ngness to pay for the product than others and a fimm must know consumer Willingness to pay for the product OB. arbitrage must be possible. c. a firm must not have market power OD. both a and b. O E. all of the above