> ... they should probably carry more copies, ... I have no idea how libraries decide on how many copies of a book to carry. I assume they have some sort of me

> ... they should probably carry more copies, ... I have no idea how libraries decide on how many copies of a book to carry. I assume they have some sort of metrics or formula they learn in school though. If there are an librarians on HN, can you share what, if any, calculation in done for this?