<span>This result is consistent with the social behavior known as "r</span>eciprocity". <span>
Reciprocity in social
psychology refers to a social standard of reacting to a positive activity with
another positive activity, remunerating kind activities. As a social build,
correspondence implies that in light of cordial activities, individuals are as
often as possible more pleasant and considerably more helpful than anticipated
by the self-interest model. </span>
