The 90-day rolling window math
**The mechanic:** Per Etsy's ranking factors documentation at help.etsy.com, Etsy's algorithm weights review recency heavily. A review left today counts more than a review from 6 months ago; a review from 91+ days ago has diminished weight relative to the 90-day window.
**The compounding effect:** Recent reviews → higher search ranking → more impressions → more sales → more reviews. The cycle is self-reinforcing in either direction. Per eRank's Etsy ranking research at erank.com, shops in the upward cycle see exponential growth; shops in the downward cycle see compound decline.
**The asymmetric risk:** A 30-day stretch without reviews matters more than the 30 days before that. Per the Marker Group's Etsy analysis at markergroup.com and seller-community data on community.etsy.com, shops that go 30+ days without a review see measurable ranking decline even on listings with strong historical performance.
**The diagnostic:** Pull last 12 months of reviews by date. Calculate reviews per rolling 90-day window. Per Sale Samurai at salesamurai.io, the typical break-point: <3 reviews/90 days → declining cycle, 3-10 reviews/90 days → stable, 10+ reviews/90 days → upward compounding.