ALA has released E-Books And Libraries: An Economic Perspective.
Here's an excerpt:
This paper provides a preliminary economic analysis of how publishers provide digital content to libraries, focusing mainly on the value that libraries place on access to e-books and how that is affected by the various restrictions that publishers place on access and use. However, because publishers are just starting to adapt to the new environment, and appear uncertain as to how to adapt, we consider not only the behavior of publishers that we currently observe in the marketplace but also possible "models" of the library-publisher relationship that may come into existence in the future.
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