How paying it forward actually spreads
Launch library · evergreen read

Paying it forward asks a person who has just received help to pass a good turn along to someone else, rather than repaying the original giver directly. It breaks the usual expectation of reciprocity and replaces it with something looser and, in some ways, more powerful: a chain that keeps moving outward instead of closing back on itself.
Studies of generosity suggest this kind of chain can genuinely extend, with one act of kindness measurably increasing the likelihood that the receiver will act generously toward someone unconnected to the original exchange. The effect tends to fade after a few links, but it rarely disappears immediately.
What makes it appealing beyond the mechanism is the shift in mindset it encourages: instead of tracking who owes whom, a person starts thinking of kindness as something to keep circulating, trusting that the system as a whole balances out even when any single exchange does not.