Okay.
Let's go e-book versus print costs. Because we're a digital library, e-books are purchased whenever possible and when available. We look at the cost of a multi-user e-book. It's often less than a transactional licensing fee and it doesn't limit access to students enrolled in only one course.
For example, licensing of two chapters of the book, Oil: A Beginner's Guide, 2008—this is an important book in Alberta right now—by Vaclav Smil, for a class of 410 students would cost the library $2,463 in U.S. currency. In contrast, the cost of an unlimited licence for three e-book versions would be $29.90 through Ebook Central, and the book would be available to all library users.
That's, in many cases, why we've gone digital.
I would say, similarly, the cost of licensing two chapters from the book, Negotiations in a Vacant Lot: Studying the Visual in Canada, by Lynda Jessup, et al, for a class of 60 students would be $414 Canadian, while the cost of an unlimited licence on Ebook Central would be $150 U.S.
There is a tremendous difference in these costs. We use those, and we also are dealing with the needs of our students, who want the material digitally. They prefer to do that. Our professors are very conscious of ensuring that students are getting materials in such a way that they're going to use them.