A study by Burger and others (2009) about the norm of reciprocity demonstrated that

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Burger and others (2009) found that people will reciprocate even if their reciprocation will be unknown. This means that people have an innate desire to reciprocate and do not necessarily expect recognition or a relationship to develop from the reciprocity. The study showed that people were more likely to help an experimenter who had previously done them a favor, even when there was no possibility of the favor being repaid or recognized.

A Study by Burger and Others (2009) About the Norm