B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
34%
34% -- completion rate for loyalty card study (endowed progress effect) (2026)
In a study by Nunes and Dreze on the endowed progress effect, the pre-filled loyalty card group achieved a 34% completion rate.
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Lighthouse Research Team
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Source verified
Evidence graded
Value
34%
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
95
Source Trust
60
Citation Chain
20
Independence
30
Methodology
60
Freshness
95
Source
Journal of Consumer Research (Nunes and Dreze)
Primary
Tier A
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Source Article
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Original Research
Journal of Consumer Research (Nunes and Dreze)
· Original study ↗
Methodology
Nunes and Dreze study, Journal of Consumer Research
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
loyalty card study (endowed progress effect): 34% completion rate. Source: Journal of Consumer Research (Nunes and Dreze) (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/endowed-progress-34-vs-19
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<blockquote cite="https://lighthousedata.io/data/endowed-progress-34-vs-19" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>34%</strong> -- completion rate for loyalty card study (endowed progress effect)<br><small>Source: Journal of Consumer Research (Nunes and Dreze) (2026) · <a href="https://lighthousedata.io/data/endowed-progress-34-vs-19" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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