Influence: The Psychology of Persuasion · chapter 2 · id influence-c2-08-the-hare-krishna-societys-airp

“The Hare Krishna Society's airport solicitation technique -- giving a flower before requesting a donation -- was so effective that it funded the expansion of temples, businesses, and properties across the United States.”

needs contextconfidence: medium⚠ extracted by pipeline, re-audit pending

Receipts

International Society for Krishna Consciousness v. Lee, 505 U.S. 672 (1992)paywalled — manual check queued
The Supreme Court upheld airport bans on solicitation, noting that face-to-face solicitation presents risks of duress that are an appropriate target of regulation.
Regan (1971), Effects of a Favor and Liking on Compliance, Journal of Experimental Social Psychology 7(6)FLAGGED: DOI not in registry
Subjects who received an unsolicited favor from a confederate purchased significantly more raffle tickets from that confederate, regardless of whether they liked or disliked him.

This claim is a stable, citable object. If you can falsify a verdict, tell us — corrections are loud here.