Earmarking donations to boost study participation? Evidence from a field experiment

Andreas Raff; Robert Böhm; Christoph Fuchs

PLOS ONE · 2025-09-08
Research article · Version of record · CC BY 4.0 · 6,598 words

Original source: Volume 20 · Issue 9 · e0331498

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Title: Earmarking donations to boost study participation? Evidence from a field experiment
Human authorship: Andreas Raff; Robert Böhm; Christoph Fuchs
Source: Complete manuscript edition 2026-10-27
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Original authors / creators: Andreas Raff; Robert Böhm; Christoph Fuchs
Original publication: PLOS ONE · Public Library of Science · 2025-09-08
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doi:10.1371/journal.pone.0331498
License & retained notices: CC BY 4.0
Raff et al © 2025
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This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Article-specific license href: http://creativecommons.org/licenses/by/4.0/.
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Evidence limits: A single charity, US $5 externally funded incentive and research-experienced academic audience; no no-incentive or personal-cash arm. Null results do not prove exact equality or generalize to self-funded major gifts. Proposed family-office controls were not tested.
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