B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
5%
5% -- sales lift for returning customers (loud, calm tone) (2026)
Using a loud, calm tone when speaking to returning customers increases sales by up to 5%.
- Stated as an 'up to' maximum
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
5%
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/archive?404=/p/use-copy-boost-results&page=4 ↗
Source Article
Science Says
Original Research
Science Says
· Original study ↗
Methodology
Research summary from Science Says; original study not named
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
returning customers (loud, calm tone): 5% sales lift. Source: Science Says (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/loud-calm-tone-sales-returning-customers
HTML Embed
<blockquote cite="https://lighthousedata.io/data/loud-calm-tone-sales-returning-customers" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>5%</strong> -- sales lift for returning customers (loud, calm tone)<br><small>Source: Science Says (2026) · <a href="https://lighthousedata.io/data/loud-calm-tone-sales-returning-customers" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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