And by lumping them together in a shop, you end up with a shelf section that is a noticeable large section as well as having the overlap phenomenon where people look at anything in the section and may find SF they wouldn't have seen in a Fantasy only section and vice-versa for Fantasy in an SF only section. It also solves the problem of splitting the output of authors writing in both genres as well as increasing the chance of a reader finding that they also like the "other" genre from an author doing both...
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