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In a competitive market, why is movie theater popcorn expensive?
One explanation is that movie patrons are considering their total willingness to pay for the movie experience so that if the ticket price plus the market price of popcorn is less than their willingness to pay (WTP), the theater has an opportunity to extract more consumer surplus by charging higher than market prices for the popcorn (that is, price discrimination). There is a working paper on the subject by Gill and Hartmann (2008), the abstract of which reads: Prices for goods such as blades for razors, ink for printers and concessions at movies are often    set well above cost.  Theory has shown that this could yield  a profitable price discrimination    strategy often termed “metering.”  The idea is that a customer’s intensity of demand for    aftermarket goods (e.g. the concessions) provides a meter of how much the customer is willing to    pay for the primary good (e.g. admission).  If this correlation in tastes for the two goods is    positive, a high price on the aftermarket good allows firms to extract a greater total price    (admissions plus concessions) from higher type  customers.  This paper develops a simple    aggregate model of discrete-continuous demand to motivate how this correlation can be tested    using simple regression techniques and readily available firm data.  Model simulations illustrate    that the regressions can be used to predict whether aftermarket prices should be above, below or    equal to their marginal cost.  We then apply the approach to box-office and concession data from    a chain of Spanish theaters and find that high priced concessions do extract more surplus from    customers with a greater willingness to pay for the admission ticket.  Locay and Rodriquez (1992) make a similar argument in a JPE article.  They essentially argue that purchases of things like movie tickets are made by groups; once individuals are constrained by the group's choice, the firm has additional market power: We present models in which price discrimination in the context of  a   two-part price can occur in some competitive markets. Purchases  take   place in groups, which choose which firms to patronize. While  firms   are perfectly competitive with respect to  groups, they have  some   market power over individual consumers, who are constrained  by their   groups' choices. We find that firms will charge an entry fee  that is    below marginal cost,  and  the  second part of  the  price is  marked   up  above marginal cost. The  markup not only is positive  but   increases with the quality of the product. The quote you are looking for is similar, and again attributes the discrepancy to price discrimination.  From the Armchair Economist (p. 159): The purpose of expensive popcorn is not to extract a lot of money from   customers. That purpose would be better served by cheap popcorn and   expensive movie tickets. Instead, the purpose of expensive popcorn is   to extract different sums from  different customers. Popcorn lovers,   who have more fun at the movies, pay more for their additional   pleasure. That is, some people like popcorn more than others.  The latter idea is that the movie experience for popcorn lovers is worth more than the sum of its parts: that a movie ticket + popcorn is worth more than either of them separately for some people.