Focus on the finite. The good news about "the long tail" is that it is likely to free up librarians to do what they do best - manage finite collections of content with high levels of expertise while leaving to others the managing of massively popular content and specialized collections beyond their focus. Rather than focusing on easily reproduced content available commercially in electronic formats librarians can focus on obtaining and preserving truly rare content that is most important to their local patrons' needs. The rest can be "borrowed" or licensed on a far more global level with lots of contextualization from local librarians and community enthusiasts to enhance its local value.
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