The norm of reciprocity, also known as the rule of reciprocity is a social norm that leads us to reward behaviors from people that have been helpful to us. It compels people to return favors when they think they have been helped. This social norm in some cases leads to people wanting to ensure that a negative behavior shown towards them is punished.
Jerry transgressed the rule by allowing Lola have the leash in her mouth. It was agreed that who gets home first controls the dog but this scenario played out by Jerry made it be a social vs relational scenario.
