s. When someone does something for us orgives us something, we feel obligated to return the favor in kind. It triggers one of the mostpowerful of social norms, the reciprocity rule, whereby we feel compelled to repay, in equitablevalue, what another person has given to us
I do this a lot...I feel like a deed has gone undone if i don't return the favor of the person that has helped me...It drives me crazy if i don't do something for them.