 One issue that has received increasing attention is price discrimination. This is discrimination based on willingness to pay, or the practice of charging more to people who are willing to pay more. This might at first seem unfair or even exploitative, but in fact it is commonplace and usually unremarkable (Elegido 2011; Marcoux 2006a). Examples of price discrimination include senior and student discounts, bulk discounts, versioning, and the sort of bargaining one finds in car dealerships and flea markets. We might see price discrimination as an implication of freedom in pricing, and according to a familiar result in economics, price discrimination increases social welfare, provided that it enables producers to increase output (Varian 1985). But some instances of price discrimination have come in for criticism. Online retailers collect and purchase enormous amounts of information about consumers, and there is evidence that they are using this to personalize prices, or tailor prices to what they think are consumers’ reservation prices, i.e., the highest amounts they are willing to pay. Some believe that this practice is unfair (Steinberg 2020), though they problem may simply be that consumers don’t know what retailers are up to.