
Behavior & Society
When Do Favors Expire?
Research suggests it’s never too early to ask for a favor in return
Amanda Chuan is a doctoral candidate at the Wharton School of the University of Pennsylvania whose research focuses on charitable giving and labor economics. Follow Amanda Chuan on Twitter @amanda_chuan
Support science journalism.
Thanks for reading Scientific American. Knowledge awaits.
Already a subscriber? Sign in.
Thanks for reading Scientific American. Create your free account or Sign in to continue.
Create Account