This document discusses the benefits of a demand-driven acquisition model for purchasing academic books. It provides data from the University of Denver that showed 47.77% of books purchased between 1999-2008 went unused, costing $477,700 in 2008 alone. The University of Denver is piloting a demand-driven model where ebooks and humanities titles will be available through discovery and automatically purchased after a certain amount of use rather than pre-purchasing titles. This model has implications for collections, researchers' access, and libraries' workflows. It also impacts scholarly publishers in revenues and costs, though electronic access and print-on-demand could provide benefits if systems support simultaneous formats and improved discovery. Book vendors will need to develop new