Why Does the Perfectly Discriminating Monopolist Look Like Perfect Competition and Why Doesn’t It? A Pedagogical Treatment for Intermediate Microeconomics

Intermediate microeconomics students comfortable with perfect competition and monopoly often struggle with the perfectly discriminating monopolist, a firm that charges every consumer exactly their willingness to pay. Such a firm produces the same total output as perfect competition yet captures all consumer surplus, an efficient outcome that violates any intuition about fairness. In total surplus, perfect competition and perfect discrimination tie and both exceed standard monopoly. In consumer surplus the order reverses and we get perfect competition, standard monopoly, and perfect discrimination. This paper offers a classroom-ready treatment: a five-consumer example, a comparison table, a data-driven pricing application, and a 60-minute lesson plan.

by Carlos Liard-Muriente

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Liard-Muriente, C. (2026). Why Does the Perfectly Discriminating Monopolist Look Like Perfect Competition and Why Doesn’t It? A Pedagogical Treatment for Intermediate Microeconomics. Available online at Journal of Economics Teaching, DOI: 10.58311/jeconteach/f5baea5a375532694cd96151c381049fb6c6cf08

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