Reciprocity

Give something first — value, help, a concession — and people feel pulled to give back.

Why it works

Humans carry a deep, cross-cultural obligation to repay what they receive; an unreturned favor creates felt indebtedness that people act to discharge. The pull works even when the initial gift was unrequested or small, and even when the return is disproportionately large.

How to do it

1. Lead with genuine, relevant value before you ask for anything.
2. Make the gift personal and unexpected — generic perks barely register.
3. When you must say no, offer a concession first; a step-down often earns a yes (reciprocal concession).

Evidence

Reciprocity is one of the most reliable findings in social psychology, demonstrated in field experiments (e.g. unsolicited gifts raising compliance and tips) across many settings. (observational)

Effect size depends on whether the gift feels sincere; transparently transactional "gifts" can trigger reactance instead.

Common mistake

Giving with a visible string attached, which reads as a transaction and kills the obligation it was meant to create.