In addition to studying the studio system, historians who take the economic approach toward the film industry also take into account

In addition to studying the studio system, historians who take the economic approach toward the film industry also take into account censorship and the rating system. Censorship is the suppression of speech or any public communication, because it is considered harmful, sensitive, or politically incorrect or "inconvenient" by the government authorities. The rate system on the other hand is used rate a film's suitability  based on its content.

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