Originally Posted by HarryT
We may be talking at cross-purposes? Are you proposing that they should allow unlimited lending, and pay a fee corresponding to what was actually borrowed, rather than agree a maximum number of simultaneous loans in advance? That strikes me as financially extremely risky for the library, because they wouldn't know in advance what their actual expenditure was going to be.
That is exactly the problem in Sweden. Libraries pay per loan and have now implemented restrictions on how many loans you can make. The benefit is that a book is never "out" when you want to loan it, but you may have to bide your time if your are maxed out.