What Is a Public Library Worth?
Public libraries are among the few services that almost every town offers free of charge, yet they are often among the first to lose funding when local budgets tighten. Part of the reason, economists suggest, is that the value of a library is unusually hard to measure. A hospital can count the patients it treats and a road can count its vehicles; a library's benefits are spread across thousands of small, private moments that leave no record.
The most common approach has been to count loans. Councils compare the number of books borrowed each year with the library's running costs and calculate a cost per loan. The method is simple, but critics argue that it understates the library's role, because a growing share of visitors come not to borrow but to use computers, study, attend classes or simply find a warm, quiet place to sit.
To capture this wider use, some researchers have turned to a technique known as contingent valuation. Residents are asked how much they would be willing to pay in tax to keep their library open, or how much they would need to be compensated if it closed. Studies using this method have often produced figures several times higher than the library's budget. Sceptics respond that people tend to exaggerate when answering hypothetical questions, since they will never actually be asked to pay.
A third approach estimates what users would have to spend if the library did not exist: the cost of buying the books they borrow, paying for internet access, or hiring a room for a community group. This “substitute cost” method has the advantage of resting on real market prices. Its weakness is that many users would not in fact buy these things; a family that borrows twenty picture books a month would probably buy two.
Some benefits resist all of these methods. Libraries are among the main places where people without internet at home can apply for jobs or government services online, and early-years reading sessions may improve children's literacy long before they start school. Such effects are real, but they appear years later and in other budgets — in employment figures or exam results — so a library rarely receives credit for them.
For this reason, a number of economists now recommend combining several measures rather than searching for a single figure. A library that is judged only by its loans, they argue, may look expensive precisely because it is succeeding at things a loan count cannot see.