Kent State University Libraries (KSUL) has been using the patron-driven acquisition (PDA) ebook purchasing model since January 2012. Now, 5 years of PDA data makes it possible to conduct a systematic comparison to evaluate different PDA scenarios based on ebook usage patterns at KSUL between Jan 1, 2012, and Dec 31, 2016. This study specifically compares the economies of the straight PDA business model and the PDA model that uses the short-term loan component. This study may help libraries gain a better understanding of how PDA works in different scenarios and how to choose the scenario that works best to fulfill their needs. Today, accumulated PDA data makes it possible to conduct a systematic comparison of different PDA business models based on ebook usage patterns. This study specifically compares the rolling cost of the straight PDA business model versus the PDA model that uses the STL component in which books are not immediately purchased, but loaned at a percentage of the purchase price.
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