Why are there links to material purchasing at sites like Amazon.com?
The purpose of providing opportunities to buy a work is twofold: First, to further promote libraries as a primary source of information and entertainment, enabling access to materials through a variety of channels—even retail, if a consumer sees it as the most attractive. Secondly, the links benefit libraries by capturing the transaction of a convenience-minded user who has opted to purchase materials after seeking them in the context of libraries. This may be because an item is not owned, is currently in use by another library patron, or is not physically near their location. Regardless of the reason, the user’s purchase benefits libraries because a portion of all sales (through either Amazon.com or the WorldCat-branded Buy It Now online store) helps support either a specific library (usually a local library the user has selected during the online ordering process) or collectively supports all libraries that participate in WorldCat.org.