Why Do All Movie Tickets Cost the Same?

gambit3 sends this quote from The Atlantic: "Like tens of millions of Americans, I have paid money to see Mission: Impossible, which made $130 million in the last two weeks, and I have not paid any money to see Young Adult, which has made less than $10 million over the same span. Nobody is surprised or impressed by the discrepancy. The real question is: If demand is supposed to move prices, why isn't seeing Young Adult much cheaper than seeing Mission: Impossible?"