The Economics of Everyday Things: 9 Prices That Make No Sense Until They Do

Some prices feel wrong the moment you see them. Popcorn costs more than the film. A gym membership sits unused for months. A hotel charges more for water than a corner shop three floors down. None of this is irrational; it is usually a well-known pricing mechanism doing exactly what it is designed to do. Here are nine examples, each with the mechanism named plainly.

1. Cinema popcorn: two-part pricing and a captive audience

The ticket price barely covers the cost of running the screen, and cinemas know it. Once you are inside, you are a captive market for snacks with almost no competing seller nearby, so the popcorn carries a large markup that subsidises the ticket. This is a two-part pricing structure: a lower entry fee that gets you through the door, and a higher margin on the items you buy once you cannot easily leave to find a cheaper alternative.

Takeaway: whenever an entry fee looks suspiciously low, check what you are required to buy once you are inside.

2. Printer ink: razors and blades

Printers are often sold near or below cost, while replacement cartridges are priced well above the ink they contain. This is the classic razor-and-blades model: sell the durable item cheaply to get it into your home, then earn the real margin on the consumable you are locked into buying repeatedly. Cartridge design that blocks third-party ink reinforces the lock-in further.

Takeaway: a suspiciously cheap main product is often a signal to check the price and lock-in of whatever you have to keep buying afterward.

3. Airline seats: yield management

Two passengers on the same flight, sitting in the same row, will often have paid noticeably different fares. Airlines use yield management, adjusting price continuously based on how far ahead you booked, how full the flight already is, and patterns in how willing different types of traveller are to pay. A business traveller booking late usually has less flexibility and a higher tolerance for price, so is charged more than a leisure traveller who booked months ahead.

Takeaway: the seat is identical; what is being priced is your flexibility and your estimated willingness to pay, not the physical product.

4. Museum tickets and 'suggested donation'

Some museums charge a fixed fee, others post a suggested donation that visitors can adjust or ignore. This reflects a public-good problem: culture and knowledge have wide social value that a pure market price would under-supply, so many museums are subsidised by public or charitable funds and use donation structures to collect more from visitors who can and will pay, without excluding those who cannot. It is a soft form of price discrimination that keeps access broad while still generating revenue from willing payers.

Takeaway: a flexible price often signals that access matters more to the seller than maximising revenue from any single visitor.

5. Carrier bags: pricing an externality

For years, supermarket bags were free, and the cost of the plastic and its disposal was absorbed by the shop and, indirectly, by everyone else through litter and waste management. Charging a small fee for bags is a textbook attempt to price an externality: a cost that was previously falling on the wider environment gets attached to the individual decision that causes it, which tends to reduce how often people take one without thinking.

Takeaway: when something free suddenly gets a small charge, it is often because a hidden cost has been made visible rather than because the item became more expensive to produce.

6. Hotel minibar water: a convenience monopoly

A bottle of water in a hotel room can cost several times what the same bottle costs at a shop down the street. Inside the room, the hotel is effectively the only seller available at that moment, especially late at night or when leaving is inconvenient. This local, temporary monopoly on convenience, not on water itself, is what supports the markup.

Takeaway: extreme markups often reflect a monopoly on convenience in a specific moment, not on the underlying product.

7. The second-cheapest bottle of wine: the decoy effect

Restaurants are often said to sell more of the second-cheapest wine on the list than any other, because diners want to avoid looking as if they chose the cheapest option while also avoiding overspending. Whether or not that specific bottle carries the best margin, the broader mechanism is real: adding a slightly pricier option to a menu changes how people perceive the options around it, a pattern economists call the decoy effect, where an added choice shifts preferences among the existing ones without ever being chosen itself.

Takeaway: your choice among a short list of options is often shaped by which extra options were placed around the one you eventually pick.

8. Gym memberships: option value and overconfidence

Millions of people pay for gym memberships they use rarely. Part of the mechanism is option value: people are willing to pay for the possibility of going, even if they do not exercise the certainty of it, because keeping the option open feels worthwhile on its own. The other part is a well-documented tendency to overestimate future motivation and attendance compared with how people actually behave once the initial enthusiasm fades.

Takeaway: a price paid for an option you might use is a different kind of purchase from a price paid for something you will definitely use, and it is worth naming which one you are making.

9. Hardback before paperback: windowing

New books usually appear first in hardback at a higher price, with the cheaper paperback following months later. This is intertemporal price discrimination, sometimes called windowing: readers who want the book immediately and are less sensitive to price buy the hardback, while more patient, more price-sensitive readers wait for the paperback. The same book, released in stages, effectively sorts buyers by how much they value getting it now versus later.

Takeaway: when the same product appears at different prices over time rather than at once, the delay itself is often the mechanism doing the sorting.

The pattern behind all nine

Look across these examples and a shared structure emerges. Sellers rarely set one flat price for one product. They set a structure: a low entry cost paired with a high-margin add-on, a durable good paired with a locked-in consumable, a single product split across time or flexibility, or a menu shaped to nudge a comparison. None of it requires assuming buyers are foolish. It only requires assuming that people value convenience, certainty, and time differently from one another, which they plainly do.

A strange price is rarely a mistake. It is usually a structure quietly doing its job.

This kind of pattern-spotting is exactly the sort of thing that turns a passing curiosity into something you actually remember, which is the same idea behind two-minute dinner party facts and behind our Economics collection, which walks through historical episodes like speculative bubbles using the same kind of mechanism-first thinking. If you want more of this style of explainer, browse Topics for the full range. Disclosure: MindSnap is our app, structured around five flagship story collections in Art, History, Psychology, Philosophy, and Economics, plus unlimited topics you can generate yourself.