Offer your thoughts or opinion on the input financial query or topic using your financial background.

In a competitive market, why is movie theater popcorn expensive?
A better question would be to ask "Why don't movie theaters charge to use the bathroom?", or "Why don't movie theaters charge for parking?". In America, either government regulation or the mall itself forbids charging for parking, or limits the amount that can be charged for parking. This tends to be more true in suburban areas where land is cheap, but less true downtown in cities. The nearest theater to me is in a mall that is also on a metro line. Those who arrive by metro to see the movie are effectively subsidizing those who arrive via automobile and park. I don't know of any place in America that charges to use the bathroom, but the practice is still common in Europe. I saw the second The Matrix film in Brussels, and had to pay to pee. I'm not sure why this isn't the case in the U.S. Maybe there are widespread regulations against this. Or maybe it's a cultural thing, that we would be so offended by this that we would never go back to the theater.