Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

In a competitive market, why is movie theater popcorn expensive?
I'm kind of shocked that no formal behavioral modeling has been proposed as an explanation yet. One such model would be steep (hyperbolic, quasi-hyperbolic) discounting.  Consumers would rather pay for popcorn later than for an expensive movie ticket now.  For instance, consumers might when purchasing the ticket see a low value of popcorn and view the ticket price as the whole price because they do not predict purchasing popcorn.  Then when entering the theater, the present value of popcorn is very high and they purchase it.  There might therefore be a market for a commitment device (such as a popcornless theater) to make the appropriate decision ex-ante.  Another commitment device that seems to be practiced is when individuals sneak their own popcorn into the theater.  They may not actually want the popcorn, but by bringing their own they ensure they do not purchase the theater's.