All markets · 30-day comparable periods
Empty time buckets are shown as zero and retain their sample size; they are not interpolated by AI.
These are the records counted in the current prevalence numerator.
Mara Voss
Inspect evidenceElias North
Inspect evidenceJulia Rook
Inspect evidenceNina Vale
Inspect evidenceC. A. Mercer
Inspect evidenceBeth Arden
Inspect evidenceIris Bell
Inspect evidenceTom Arlen
Inspect evidenceS. J. Pike
Inspect evidencePsychological decreased from 100% to 81.8% across comparable 30-day windows, a 18.2 percentage-point downward movement. The feature currently appears in 2 tracked market segments.
Amazon New Releases has the highest current prevalence at 100% (6 of 6), while Amazon Bestsellers is lowest at 60% (3 of 5).
Inspect the matching covers alongside non-matching covers from the same source types. Look for whether psychological co-occurs with particular typography, imagery, colour, or subgenre choices before treating this as a durable convention.
Current window: 9 matching covers from a sample of 11.
Previous window: 10 matching covers from a sample of 10.
18.2 percentage points of measured downward movement.