Definition
A free sample is a small gift of product or service, given without obligation, designed to trigger the rule of reciprocation in the recipient. Cialdini uses Costco's in-store sampling stations as a paradigmatic case: a 50-cent slice of frozen pizza routinely produces a $12 purchase of the same item. Free trials of software, drink coupons in hotel rooms, complimentary upgrades, and "thank you" gifts that accompany requests for donations are all variants on the same pattern.
The economic logic only works because the obligation to repay routinely produces returns larger than the gift's cost. Most marketing-driven samples are loss-leaders by design — the average customer pays back many multiples of the sample value.
Why it matters
How it works
The free sample is the operator's opening move in a planned compliance sequence. The first step (the gift) is engineered to look like generosity; the second step (the request) leverages the resulting felt obligation. The target, who did not choose to enter the exchange, finds it socially difficult to refuse the gift and then equally socially difficult to refuse the follow-up request.
The defense, as with all reciprocation tactics, is to mentally re-label the gift. A free sample handed out by the manufacturer is not a favor from a friend — it is a marketing expense. The reciprocity rule binds you to repay favors; it does not bind you to repay marketing expenses.