A lot of the theoretical underpinnings about why capitalism is a good system are based on the law of one price. Especially in the context of an oligopoly, being able to price-discriminate on such an individual level leads to really bad outcomes.

>A lot of the theoretical underpinnings about why capitalism is a good system are based on the law of one price.

Why? Competition for instance, works fine even with price discrimination, because bidders will still compete with each other on offering the lowest price.