Why Does the Same Seat Cost Different Amounts? Charging What Each Buyer Will Pay
By the BrainSnail editorial team. How these articles are written and checked, and how to tell us when one is wrong.
Selling the same thing to different people at different prices is standard commercial practice and takes forms most buyers do not recognise as pricing at all. The economics of it are clear and the fairness is contested.
What it requires
Charging different prices for essentially the same product requires three conditions, and understanding them explains where the practice appears and where it does not. The seller must have some pricing power, since a firm facing identical competitors cannot charge above the market rate to anybody. The seller must be able to distinguish buyers who will pay more from those who will not, either directly or through some observable proxy. And resale must be prevented, since otherwise buyers getting the low price would simply sell to those facing the high one and undo the arrangement. That third condition explains why the practice is common in services, which cannot be resold, and in goods with tight distribution control, and rare in commodities.
The forms it takes
Economists distinguish degrees and the everyday examples are recognisable:
- •Charging each buyer their maximum willingness to pay, which requires knowing it and is rare in pure form
- •Quantity discounts and multi-part tariffs, where the price per unit falls with volume
- •Versioning, offering a degraded and a premium variant so buyers sort themselves
- •Group pricing by observable category, including student, child and senior rates
- •Time-based pricing, including peak fares, advance purchase and clearance
- •Geographic pricing, charging different amounts in different markets for the same product
Whether it is bad
The welfare analysis is genuinely mixed, which is why the practice is regulated selectively rather than prohibited. It can increase total output and serve customers who would not be served at a single price, since a seller able to charge less to price-sensitive buyers will sell to them rather than not at all, and student and concession pricing plainly works this way. It transfers value from buyers to the seller, capturing what buyers would otherwise have kept. It can be a means by which fixed costs are recovered in industries where a single price covering them would exclude many, which is the argument in pharmaceuticals and in transport. And it can be used to entrench market power by undercutting rivals selectively. Which effect dominates depends on the case.
Why airline pricing looks chaotic
Air fares are the most visible instance and the mechanism explains behaviour that otherwise looks arbitrary. Seats on a single flight are sold at many prices through fare classes with different conditions attached, including advance purchase requirements, minimum stays and refundability, and those conditions exist to separate travellers who are price sensitive and flexible from those who are not and who will pay more for a seat next week. Revenue management systems adjust how many seats are available in each class continuously, using forecasts of demand, which is why the displayed price moves. A last-minute fare is high because the remaining buyers are the inflexible ones. None of this requires knowing anything about an individual buyer, since the conditions do the sorting, which is why it survives scrutiny that personalised pricing would not.
What the law restricts
Regulation targets particular grounds and particular effects rather than the practice as such. Discrimination on protected characteristics including race, sex and disability is prohibited outright in most jurisdictions regardless of any commercial rationale. Competition law restricts pricing that harms competition, including selective price cuts aimed at excluding a rival and discrimination between business customers that distorts the market between them. Consumer protection law requires disclosure of prices and prohibits misleading presentation, which bears on personalised pricing where the buyer cannot see what others pay. Data protection law constrains the inputs, since personalised pricing based on inferred willingness to pay requires processing personal data. And several jurisdictions have considered specific rules on algorithmic personalised pricing without settling on an approach.
The takeaway
The practice needs pricing power, a way to distinguish buyers and prevention of resale, which is why it is common in services and rare in commodities. Versioning and concession rates let buyers sort themselves without the seller knowing anything directly. It can serve customers a single price would exclude while transferring value to the seller, which is why regulation targets specific grounds rather than the practice itself.