"As for collaboration - I have done a lot, 26 books, and found publishers increasingly resistive to them. It's not that the books are bad; editors won't even read them"

This quote by Piers Anthony talks to the problem of cooperation in the publishing market. He has composed 26 books in cooperation with other authors, however has actually discovered that publishers are ending up being significantly resistant to them. This might be due to the reality that editors are not going to make the effort to read the books, or that they are not confident in the quality of the work. It might likewise be that publishers are not thinking about taking a risk on a book that is not written by a single author. Whatever the factor, it is clear that collaboration is ending up being more difficult in the publishing market. This could be a major challenge for authors who are seeking to work together on a book, as it might be tough to discover a publisher who wants to gamble on their work.