Reciprocity is a universal principle of influence. As a social construct, people feel obliged to give back to others the form of behaviour, gift, or service that they have received first. Friends invite you over to their house for dinner and you feel obligated to return the favour. Someone drops off a small gift to your office at Christmas and you feel the need to run out and get them something.
Friends invite you over to their house for dinner and you feel obligated to return the favour. Someone drops off a small gift to your office at Christmas and you feel the need to run out and get them something.