in 1976, Phillip Kunz sent Christmas cards with a short note out to complete strangers
Despite not knowing him, 20% of recipients sent one back
When someone does something ind for us, we often feel we need to do something kind in return
See the full study here :
Kunz, P. R., & Woolcott, M. (1976). Season’s greetings: From my status to yours. Social Science Research, 5(3), 269–278. https://doi.org/10.1016/0049-089X(76)90003-X
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