Price discrimination, a microeconomic strategy, involves selling identical or similar products at different prices depending on buyers' willingness to pay, distinct from product differentiation based on production costs. This practice depends on market segmentation, consumer responsiveness, and the seller's market influence. Legal frameworks such as the Robinson-Patman Act examine its potential anticompetitive effects, as seen in cases involving justices like John Paul Stevens, who associated discriminatory pricing with harm to competition, and Harlan F.
Stone, who stressed justifications rooted in cost differences. Scholars such as William O. Douglas questioned the validity of matching competitors’ prices, while Earl Warren connected price discrimination to antitrust review. These viewpoints together illustrate how legal and economic evaluations shape the discussion about its function in market dynamics.