Media & Publishing / Audience
Readers Per Copy / Average Issue Readership RPC (aka pass-along rate, readers-per-copy; AIR = average issue readership)
How many people actually read each copy sold, usually more than one, because copies get shared.
The fork, why two teams get different numbers
CIRCULATION vs READERSHIP is a genuine, load-bearing gap.
In the Metric Library
- The full fork, both definitions worked all the way through
- The trap that makes the number lie, on a real export
- Every formula variant, spelled out
- The reconciliation anchor, what to tie it to and when to refuse
Reference: readership-survey methodology e.g. recent-reading/first-read (reference); Alliance for Audited Media (AAM) circulation (reference)