Price discrimination

The same product, sold to different buyers at different prices: price discrimination is everywhere once you look, and it is more subtle than mere unfairness.

Price discrimination is the practice of charging different customers different prices for the same or a similar product, based not on differences in cost but on differences in their willingness to pay. Far from being a marginal trick, it is pervasive in modern commerce and a central tool by which firms capture value.

Capturing the surplus

The logic of price discrimination is to convert consumer surplus into profit. In a single-price market, the firm must set one price, leaving some buyers who would have paid more keeping the difference as surplus, and losing some who would have paid something but less than the price. By charging different buyers closer to what each is willing to pay, the firm captures more of that surplus: high prices from those who will pay them, lower prices from those who otherwise would not buy at all. Done well, it raises profit and can also expand the total quantity sold.

How firms do it

Price discrimination requires the firm to have some market power, to be able to prevent resale between high-price and low-price buyers, and to find a way to sort customers by willingness to pay. Firms achieve the sorting through many devices: charging different groups different prices directly, where they can be identified, as with student or senior discounts; offering versions or tiers that lead customers to self-select, as with first and economy class or premium and basic products; and varying prices by time, place, quantity, or conditions attached. Much everyday pricing, from airline fares to coupons to bulk discounts, is price discrimination in disguise.

Good, bad, or neither

Price discrimination is neither simply exploitative nor simply benign. It can harm consumers who pay more and offend notions of fairness, and aggressive forms can be a way of exercising and entrenching market power. But it can also expand access, since the low prices charged to less willing buyers may serve customers who would be priced out under a single price, and it can make otherwise unviable products viable. Its welfare effects depend on the case, which is why competition policy treats it cautiously rather than condemning it outright.

Price discrimination is one of the most important and least understood features of real pricing, the routine practice of charging different buyers different prices to capture the value each places on a product. Recognising it, behind the discounts, versions, and tiers that disguise it, reveals how much of modern commerce is built on the simple fact that different people will pay different amounts for the same thing.