Price Discrimination
In one line. Price discrimination is charging different consumers different prices for the same good. It needs market power, separable markets with no resale, and different price elasticities across groups. It comes in first, second and third degree and transfers consumer surplus to producer surplus. H2 only.
Exam relevance: a core H2 microeconomics theme, firms and market structures recur across essay and case study almost every year, on ETG analysis. Taught the way an economics tutor who wrote the answer keys teaches it.
01What price discrimination is
Price discrimination is a firm selling the same good to different buyers at different prices, a strategy only a firm with market power can use.
H2 only. This whole topic, costs, economies of scale and market structures, is H2 content. H1 students do not study it, so if you are taking H1 Economics you can skip this page.
Price discrimination is charging different prices to different consumers for the same good, where the price difference does not reflect a difference in the cost of supply.
Note that this page carries no diagram: the strategy is argued from the three conditions and from what happens to consumer and producer surplus, not from a required diagram.
02The three conditions
Price discrimination is only possible when three conditions hold together, and naming all three is what scores marks.
- Market power. The firm must be a price setter, not a price taker; a perfectly competitive firm could not charge above the going price.
- Separable markets, no resale. The firm must be able to split consumers into groups and prevent arbitrage, the resale of the good from the cheap group to the dear one, which would undo the strategy.
- Different price elasticities. The groups must have different price elasticities of demand, so it is profitable to charge each a different price.
The firm charges the group with less elastic demand a higher price and the group with more elastic demand a lower price, raising total revenue and producer surplus.
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03First, second and third degree
Economists distinguish three forms by how finely the firm separates buyers.
- First degree. The firm charges each consumer the maximum they are willing to pay, capturing all consumer surplus. It is the limiting, mostly theoretical case.
- Second degree. The price varies with the quantity or version bought, for example bulk discounts or tiered packages, so consumers self select.
- Third degree. The firm charges different identifiable groups different prices, for example student versus adult, or peak versus off peak. This is the form most often examined.
04The effect on surplus
Price discrimination transfers surplus from consumers to the producer, and the firm designs it to do exactly that.
By charging each group closer to what it is willing to pay, the firm converts consumer surplus into producer surplus and raises its revenue. The less elastic group pays more than under a single price, while the more elastic group may pay less. How much surplus moves depends on how different the elasticities are and how completely the firm can separate the markets.
05Who gains and who loses
Price discrimination is not simply bad for consumers, which is what makes its evaluation interesting.
The firm clearly gains, capturing surplus and raising profit. Consumers in the less elastic group pay more. But consumers in the more elastic group may pay less and so gain access they would not otherwise have, for example students or off peak travellers priced in. And the extra revenue can fund a larger supply, more concerts or more flights, widening access overall. The net effect on welfare depends on the case.
06Common misconceptions
Give all three conditions and apply each to the example, including how resale is actually prevented. And do not treat price discrimination as harming everyone: the more elastic group can gain access, so the welfare verdict is conditional, not automatic.
07Test yourself
- State the three conditions for price discrimination and apply each to student versus adult pricing.
- Explain why the firm charges the less elastic group the higher price.
- Explain one way price discrimination can leave some consumers better off.
08Questions students ask
Price discrimination is charging different prices to different consumers for the same good, where the price difference does not reflect a difference in cost. It requires a firm with market power, the ability to separate consumers into groups and prevent resale, and groups with different price elasticities of demand. It raises producer surplus by capturing consumer surplus. This is H2 content.
First, the firm must have market power, so it is a price setter not a price taker. Second, it must be able to separate consumers into groups with different price elasticities of demand and prevent resale or arbitrage between them. Third, those groups must actually have different elasticities, so it is worth charging each a different price.
Third degree price discrimination charges different prices to different identifiable groups of consumers, such as students versus adults or peak versus off peak travellers. Each group has a different price elasticity of demand, so the firm charges the less elastic group a higher price and the more elastic group a lower one. It is the form most often tested at A Level.