University libraries are expected by faculty and graduate students to carry the important if not all the technical journals that are relevant to their fields. Indeed, the quality and depth of the library may significantly affect a university's ranking and its ability to attract well known scholars and promising graduate students, which in turn affects its ability to attract research grants and donations. For these reasons a university library's demand for technical journals may be very inelastic. They have little choice but to subscribe to most such journals.
Because libraries must subscribe to these journals, individual professors, grad students, scientists, and others tend to have a relatively elastic demand for these publications.. after all they can go to the library (or if a professor they can have a grad student photocopy articles of interest :).
These differences in elasticity plus the relative ease of preventing resale generates an ideal environment for price discrimination.
12. Publishing companies typically charge libraries higher subscription rates than individuals for technical journals. (By technical journals we mean publications where articles are written by experts in a field for other experts such as the New England Journal of Medicine or Molecular Biology or the Journal of Public Economics. It is not uncommon to find that rates charged to libraries are 5 or 10 times or even more above those charged to individuals. The best explanation for the ability of the firms to do this is that: