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I think the OP means trends such as vampires, zombies, military as a focus in various genres. These come and go often powered by what is popular at the movies or on TV. That would be a good question for your librarian who subscribes to the various publisher trade magazines.
FWIW, vampire romance has fallen off to be replaced by multiple paranormal creatures (werewolves, zombies, human-bears, etc). Mystery cozies currently are being saturated by romance writers who do no research and can't write very good mysteries. Soon this will turn readers off the genre and they will look elsewhere. Space opera is very big in scifi right now.
Obviously, there is other stuff - this is just a microcosm that I have gleaned.
Last edited by Tarana; 07-06-2018 at 03:32 PM.
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