Claire Messud has a theory:
Here’s the deal: men, without thinking, will almost without fail select men. And women, without thinking, will too often select men. It’s a known fact that among children, girls will happily read stories with male protagonists, but boys refuse to read stories with female protagonists. J.K. Rowling was aware of this: if Harry Potter had been Harriet Potter, none of us would know about her.
And we don’t change our spots when we grow up. Last year, I was one of nine judges awarding an international literary prize for a writer’s body of work. Each of us nominated a candidate, and five of us were women; but only one of our nomineesonly one out of ninewas female. (I myself enthusiastically nominated a man.) Our cultural prejudices are so deeply engrained that we aren’t even aware of them: arguably, it’s not that we think men are better, it’s that we don’t think of women at all. The absence of women from lists and prizes leads, then, to the future absence of women from lists and prizes. Now, lists and prizes mean nothing, of course; except that they inform curious readers about who and what to read.