What Is Price Discrimination? First, Second, and Third Degree Explained

Search Fintrev

Search our guides, reviews and glossary.

Price discrimination is the practice of charging different customers different prices for the same good or service when the price gap is not explained by a difference in the cost of supplying them. Economists sort it into three degrees. First-degree pricing charges each buyer their individual maximum. Second-degree price discrimination varies the price with the quantity or version a buyer chooses. Third-degree pricing sets different prices for identifiable groups such as students or seniors. Each degree requires the seller to know progressively less about individual buyers.

How price discrimination works

A seller charging one price faces a trade-off. A high price earns a large margin on each sale but loses buyers who value the product less. A low price wins those buyers but gives away margin to everyone who would have paid more. Price discrimination escapes the trade-off by charging the high-value buyers more and the low-value buyers less at the same time.

First-degree (perfect) price discrimination

In first-degree price discrimination, also called perfect price discrimination or personalized pricing, the seller charges every customer exactly their maximum willingness to pay. Consumer surplus (the gap between what a buyer would pay and what they actually pay) falls to zero because the seller captures all of it.

A perfectly discriminating monopolist keeps selling until the last buyer’s willingness to pay equals marginal cost, so it produces the same quantity a competitive market would and the deadweight loss of ordinary monopoly disappears. All the surplus goes to the producer: the outcome is efficient but not evenly shared.

First-degree price discrimination example: negotiated sales come closest. At a used-car dealership, a salesperson reads each customer’s budget, trade-in situation and urgency and bargains toward that person’s ceiling. No seller knows every buyer’s exact maximum, and haggling with thousands of customers is slow and costly, so perfect price discrimination remains mostly a benchmark.

Second-degree price discrimination

Second-degree price discrimination applies when the seller cannot identify who values the product most. Instead it offers a menu of prices tied to quantity or product version and lets buyers reveal themselves by what they choose. It is also called menu pricing or product versioning.

Common forms include:

• Quantity discounts: a lower unit price for larger purchases, the model behind warehouse clubs such as Costco and Sam’s Club.
• Bundle offers: buy two, get one free.
• Block pricing: phone or utility plans that charge one rate up to a limit and a different rate beyond it.
• Versioning: basic and premium editions of software, or economy and business seats on the same flight.
• Coupons and loyalty programs: discounts that go to buyers willing to clip, track or return, who tend to be more price-sensitive.

For a hypothetical example, a café sells one coffee for $3 or a punch card of ten for $24 ($2.40 each). Occasional customers who value convenience pay $3. Regulars who drink coffee daily, and would leave for a cheaper café if every cup cost $3, take the card. The café never asks who is who. The menu does the sorting.

Second-degree pricing leaves some consumer surplus in place, because buyers who choose the discounted option often value it above the price they pay. It is easier to run than first-degree pricing because the seller needs only a sensible menu, not data on each customer.

Third-degree price discrimination

Third-degree price discrimination, or group price discrimination, charges different prices to groups the seller can observe: students, older adults, military personnel, children, residents of a particular country. Movie theaters, amusement parks, museums and restaurants use it widely. Airlines and hotels also price differently by when a customer books, separating last-minute business travelers from leisure travelers who plan early.

The logic rests on the price elasticity of demand. The group whose purchases fall sharply when price rises (elastic demand) gets the lower price, and the group that keeps buying (inelastic demand) pays more. A profit-maximizing firm sets each group’s price so that marginal revenue is equal across groups and equal to marginal cost.

Worked examples

A two-group cinema (hypothetical)

Suppose a cinema has 100 adults willing to pay $15 per ticket and 100 students willing to pay $8. Each extra ticket costs $2 to serve (cleaning, staff time).

The group-priced outcome earns more than either single price, and 100 students see the film who would have been priced out at $15. The result holds only if the cinema can verify student status, for example with an ID check at the door. Otherwise adults would buy student tickets.

The markup rule

For each separate market, profit maximization gives the inverse elasticity rule:

P = MC ÷ (1 + 1/E)

Here P is price, MC is marginal cost and E is that group’s price elasticity of demand (a negative number). Assume MC is $4 in both markets:

• Group A, elasticity of −2: P = 4 ÷ (1 − 0.5) = $8.00
• Group B, elasticity of −4: P = 4 ÷ (1 − 0.25) = $5.33

The less elastic group pays the higher price. The rule assumes constant marginal cost and that both groups’ elasticities are greater than 1 in absolute value at the chosen prices.

On a standard third-degree price discrimination diagram, the two markets share one marginal cost line, and the steeper, less elastic demand curve shows the higher price.

Conditions needed for price discrimination

Three conditions have to hold together.

1. Market power (imperfect competition). The seller must be a price setter rather than a price taker. In perfect competition, any firm charging above the market price loses its customers to rivals. A textbook monopoly is not required: brand loyalty, location, patents or switching costs can supply enough power, which is why airlines, cinemas and software firms can sustain group or menu pricing.
2. A segmented market. Buyers must differ in willingness to pay or elasticity, and the seller must be able to tell them apart, either directly (ID, age, location) or through menus that buyers self-select into.
3. No resale (no arbitrage). If low-price buyers can resell to high-price buyers, the high price collapses toward the low one. That is why student tickets are checked at the door, airline tickets carry names, and drug makers restrict cross-border reselling.

Why price discrimination matters

For the firm, the case is higher profit and sales to customers it would otherwise lose. That suits industries with high fixed costs and low marginal costs, such as airlines, software and pharmaceuticals, where any sale above marginal cost helps cover overhead.

For society, the verdict is mixed. Price discrimination can be desirable when it increases output and serves buyers excluded at a single price, such as discounted fares for students or lower drug prices in poorer countries. It is less benign when it mainly transfers surplus from buyers to the seller without expanding access.

Limitations and risks

• Information costs: estimating willingness to pay takes data, staff and time, especially for firms with many customers.
• Leakage: resale, shared accounts, borrowed IDs and gray-market imports erode the price gap.
• Customer backlash: buyers who learn they paid more than others for the same item may feel cheated and take their business elsewhere.
• Legal limits: in the United States, the Robinson-Patman Act of 1936 restricts price discrimination between business buyers of goods of like grade and quality when it may harm competition, with cost differences and meeting a competitor’s price as recognized defenses. Pricing by protected characteristics such as race or religion can violate civil rights laws. Student, senior and veteran discounts are generally lawful, but third-degree pricing is not automatically legal in every form or jurisdiction.

What price discrimination is not

• Cost-based pricing: charging more for overnight delivery or for a remote location reflects a higher cost, not discrimination.
• Product differentiation: making a product distinct from a competitor’s creates a different product rather than a different price for the same one. Versioning sits on the border: the versions differ, but the price gaps often exceed the cost differences.
• Inflation or general price changes: a price rising for everyone over time is a price-level change, tracked by measures such as the Consumer Price Index.

The Bottom Line

Price discrimination matters most to firms with high fixed costs and low marginal costs, such as airlines, software makers and drug companies, and to the buyers they sort into groups. It can raise profit while serving customers a single price would exclude. When it only shifts surplus to the seller, the case weakens, and laws such as the Robinson-Patman Act limit some forms.