In the US movie theater line, whether it is blockbuster or low-cost production, the fare is the same. This does not seem to be in line with the economic theory of "demand size determines the price". Some researchers have pointed out that any theater The price of all movies released during the same period is the same, a phenomenon formed in the 1970s. Not only the film industry, sports events and performances also follow this pattern. Although at some times and in some regions, mobile pricing can enable Film companies and theaters have higher earnings, but for theaters, keeping the same ticket price for different movies still outweighs the disadvantages. What is this paragraph most likely to tell next? ['Reasons why the same ticket price for different movies is better for the theater.', 'Main reference factors for determining the fare of the U. S. film industry.', 'The relationship between film production costs and audience demand and film pricing.', 'Formation of fares in other industries such as sports events and performances.']