Final answer:
The social norm where we give something in return when we get something is known as reciprocity norm.
Step-by-step explanation:
The social norm where we give something in return when we get something is known as reciprocity norm. It is a form of exchange that is based on the principle of mutual benefit and fairness. This norm is prevalent in various relationships, such as family and friendships, where there is an expectation of reciprocation.