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In a competitive market, why is movie theater popcorn expensive?
The cost of the popcorn is simply the hidden extension of the price the consumer pays for the movie ticket. Similar to the tips in the restaurant. And movie theaters do not compete by lowering the unit price. Instead to maintain the revenue per customer they try to offer more value - bigger screen, better sound, more comfortable seats, etc. That is why the price of the popcorn just like the price of the ticket itself does not go down in the competitive market.