That seems like a category error to me, 'jams' isn't the same type (or scope) of category as 'books'. I suppose what you're trying to say is that different cate

That seems like a category error to me, 'jams' isn't the same type (or scope) of category as 'books'. I suppose what you're trying to say is that different categories can support different amounts of choice, but it's not at all clear to me that this is the case.