Merchandising may be making news these days as various online influencers try their hands at it. But sports teams, publishers, film/TV studios, and others have long understood its value. For two reasons, having "merch" as part of a book publicity campaign can be wise for publishers (and self-published authors). One is an additional revenue stream, and the other is free advertising. For example, when someone buys a t-shirt promoting your book, you earn a percentage of the sale prices. But even more importantly, when they wear the shir...
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