________ is the practice whereby a firm charges differential prices to maximize profits.

A) Optimal lot sizing
B) Fixed pricing
C) Nonperishable pricing
D) Price discrimination

Price discrimination is the practice of charging different prices to different groups or individuals in order to maximize profits. This can take various forms such as charging different prices for the same product or service based on the consumer's willingness to pay, geographic location, age, student status, or other factors. The goal is to extract as much value as possible from each segment of the market by charging the highest price that each group is willing to pay.