B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
22%
22% -- monthly organic traffic loss for high-duplication eCommerce sites (2025)
High-duplication eCommerce sites lose approximately 22% of their monthly organic traffic compared to similar well-structured stores.
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
22%
Unit
Percentage
Data Vintage
2025
Entity
Sample Size
500
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
50
Source Trust
60
Citation Chain
60
Independence
30
Methodology
45
Freshness
95
Source
NineStats
Primary
Tier C
https://ninestats.com/organic-traffic-loss-duplicate-content/ ↗
Source Article
Organic Traffic Loss from Duplicate Content: A Quantitative SEO Study
Duplicate content is one of the most persistent issues affecting search engine optimization, with measurable consequences for organic traffic and website performance. While search engines do not typically impose direct penalties for duplicated content, multiple studies indicate that it can significa…
Original Research
NineStats
· Original study ↗
Methodology
Compared to similar well-structured stores with minimal duplication
Methodology documented
Segmentation
IndustryeCommerce
RoleSEO Specialist
Channelsearch
Cite this stat
Plain Text
high-duplication eCommerce sites: 22% monthly organic traffic loss. Source: NineStats (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/ecommerce-high-duplication-traffic-loss
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<blockquote cite="https://lighthousedata.io/data/ecommerce-high-duplication-traffic-loss" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>22%</strong> -- monthly organic traffic loss for high-duplication eCommerce sites<br><small>Source: NineStats (2025) · <a href="https://lighthousedata.io/data/ecommerce-high-duplication-traffic-loss" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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