B
Evidence Grade B
Graded
under review
Safe to Cite
Current
47%
47% -- reduction in sales harm from negative comparative reviews for negative comparative reviews vs normal reviews (2026)
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
47%
Unit
Percentage
Data Vintage
2026
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Science Says
Primary
Tier B
https://app.sciencesays.com/p/encourage-comparisons-in-your-reviews ↗
Source Article
Encourage comparisons in your reviews
Original Research
Science Says
· Original study ↗
Methodology
Research summary from Science Says; underlying study methodology not detailed on page
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
negative comparative reviews vs normal reviews: 47% reduction in sales harm from negative comparative reviews. Source: Science Says (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/negative-comparative-reviews-47-less-harmful
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<blockquote cite="https://lighthousedata.io/data/negative-comparative-reviews-47-less-harmful" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>47%</strong> -- reduction in sales harm from negative comparative reviews for negative comparative reviews vs normal reviews<br><small>Source: Science Says (2026) · <a href="https://lighthousedata.io/data/negative-comparative-reviews-47-less-harmful" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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