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Buying popcorn or a soft drink to accompany a trip to the cinema has been a long cherished tradition - but just how much is that bucket of popcorn setting you back?

The cost of buying refreshments at cinemas has risen steeply over the past few years - as the cost of licensing films, heating and lighting cinemas and making up for shrinking big screen audiences has been added onto the snacks section.

Tom Brook reports from New York for Talking Movies.