The Pacific Business News says Harry is helping sell books, other books. This refers not just to leach literature that makes money from interest in Harry Potter specifically -- there is a book that defines all the terms in the series, and another that explains the many mythological creatures that appear or are discussed in the books -- but to other series by other authors.
"Harry Potter has done two important things," Gum explained. "The first is that children and their parents now realize that children are perfectly capable of reading very long books. The second is that the Potter series has spawned a whole wave of fantasy and magic books."