ˇAxiom
lThe more a book in a library is exposed, the more effective the library.
ˇ
ˇDefining “an exposure” as a simple count
lPros
ˇEasy; can different levels of granularity
lCons
ˇ5 × 1 day borrowing is five
times more exposure than 1 × 5 day borrowing
ˇShorter circulation would increase counts