From: Fred Jenkins <[log in to unmask]>
Date: Wed, 25 Jan 2012 21:01:34 -0500

I don't think it is usage-based pricing, but rather on-demand
purchasing.  Once an e-book is purchased through PDA, subsequent cost
per use is either non-existent or nugatory (if you count a tiny
fraction of ongoing hosting fees for e-book collections)
.
Fred W. Jenkins, Ph.D.
Professor and Associate Dean for Collections and Operations
University of Dayton Libraries
106A Roesch Library
Dayton, OH 45469-1360


On Wed, Jan 25, 2012 at 7:16 PM, LIBLICENSE <[log in to unmask]> wrote:
>
> From: Sandy Thatcher <[log in to unmask]>
> Date: Wed, 25 Jan 2012 10:35:29 -0600
>
> Is not PDA a form of "usage-based pricing" for books?  PDA services
> provide access to all (or almost all) of a publishers' books, and a
> usage metric determines when a purchase occurs. A budget for PDA
> provides a "cap" on how much money is to be spent in this way every
> year.  This contrasts with the "approval plan" model where all books
> fitting a certain category are purchased without regard to
> demonstrated actual need, much as a subscription provides access to
> all articles in a journal regardless of how many of them are actually
> ever used.  Are there significant differences I'm missing?
>
> Sandy Thatcher