Which principle of persuasion relates to the obligation felt after receiving something?

The principle of persuasion that relates to the obligation experienced after receiving something is reciprocity. This principle is based on the social norm that when someone does something for you, you naturally want to return the favor. In many contexts, this can manifest through the idea that receiving a gift or a helpful gesture creates a psychological obligation to reciprocate, which can influence behavior in various interpersonal interactions.

For example, if you receive a favor or assistance, the feeling of indebtedness may lead you to feel compelled to help that person in return or support their cause. This principle is extensively utilized in marketing and negotiation strategies, where entities often offer free samples, services, or favors to create a sense of obligation in the recipient.

The other principles do not encompass this specific dynamic of obligation following the receipt of a benefit. Social proof involves the influence of others' behaviors on an individual's choices, liking is about personal attraction and positive feelings towards others, and authority refers to the influence derived from perceived expertise or credibility. None of these directly address the concept of feeling obligated to reciprocate after receiving something.