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Overall, genres create expectations, hopes and promises bringing pleasures if these hopes and promises are fulfilled. The idea of audience foreknowledge will lead to a certain set of expectations. Since film industry is made because of the audience and for the audience, so to catch the trends and audience’s attention, is this the reason why genres change over time? Indeed, the more the world develops, the more people expect.
https://duyenhuynh201.wordpress.com/2021/01/20/genre-and-its-what-whyand-how
Movie Genres 