{"id":2108,"slug":"spiegel-too-good-to-be-true-effect","title":"Spiegel — purchase likelihood PEAKS at 4.0-4.7 stars and DECLINES toward 5.0 (too-good-to-be-true)","kind":"reference","scope":"business","status":"current","audiences":["kevin","candid-team"],"topics":["review-revenue-causal-evidence"],"reference_body":"**Claim:** The same Spiegel study found purchase likelihood **typically peaks at ratings in the ~4.0-4.7 range and declines as ratings approach a perfect 5.0** — \"products with an average star rating in the 4.7-5.0 range are less likely to be purchased than those in the 4.2-4.7 range... shoppers see ratings at the far end of the spectrum as 'too good to be true.'\"\n\nConsistent with the finding that many shoppers actively seek out negative reviews to gauge credibility.\n\n**Source:** Spiegel 2017 / PowerReviews.\n\n**Confidence:** Verified.\n\n**Caveat:** Primary PDF uses both \"4.0-4.7\" in main text and \"4.2-4.5\" in its summary table — minor internal discrepancy.\n\n**Why this matters for Candid:** A business with a 4.5 rating outperforms one with a 5.0 rating. The widget should not treat 5.0 as the \"best\" target — and any advice it gives should reflect this counterintuitive ceiling.","rationale_body":null,"metadata":null,"links":{"outgoing":[],"incoming":[{"slug":"research-brief-smb-widget-market-difficulty-june-2026","title":"Research brief: SMB widget market difficulty — six ranked factors (June 2026)","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"reviews-as-conversion-moat","title":"Factor 5 — Trust/review moats (conversion, not just ranking)","kind":"reference","scope":"business","link_type":"depends-on"}]},"created_at":"2026-06-23T19:16:04.249Z","updated_at":"2026-06-23T19:16:04.249Z"}