
The Rule of Reciprocity is well described in the book, 'Influence, the Psychology of Persuasion' by Dr. Robert Cialdini. In his book, Dr. Cialdini describes, "the reality of internal discomfort and the possibility of external shame" which is brought about when a favor or kindness is extended by one person or group toward another and this act then, creates a feeling of obligation in the recieving person or group. This feeling of obligation offers sales people a great opportunity to sow the seeds of guilt within a potential client or customer causing them to sometimes buy an item or service that they might have otherwise passed by. Dr. Cialdini describes the fund raising techniques of the Hare Krishna cult members as being a textbook example of an application of the rule of reciprocity. A cult member insists on giving a passer by a flower as a "gift" and then asks for a small "donation". The unwilling flower recipient feels such guilt at accepting the flower that they take out their wallet and give to help themselves to feel better about the "gift".

In his book, Dr. Cialdini instructs his readers how to say "no" to a sales pitch or to a guilt laden request. He asks the readers to look past the obvious guilt and blame and to see the request for what it really is. "Perhaps we can avoid a confrontation with the rule by refusing to allow the requester to commission its force against us in the first place. Accept the desirable first offers of others but accept those offers only for what they fundamentally are, not for what they are represented to be. We should look to participate fairly in the 'honored network of obligation'. As long as we percieve and define the rule of reciprocation being enacted as a compliance tactic instead of a favor, we no longer are obligated".
Incidentally, the Salvation Army volunteer outside the supermarket is not invoking the rule of reciprocity. That person ringing the bell in the snow is asking for a donation for a poor family so get out your wallet and be generous this Christmas.