In psychological terms, Mood-Congruent Behavior means that expressed actions are consistent with how one feels. If someone has a worried look on their face, others might view that person as being anxious; a bright and open attitude will be seen in a happy person. In these cases, people are associating the person’s behavior (the face being made) to their mood.
This concept is used in the psychology of consumer behavior where the marketer tries to create a certain mood in the buyer that matches the qualities of the product. For example, if a perfume is supposed to make one feel desirable and attractive, the marketer will use ads and store designs that will create a mood that makes the buyer
feel the same way, resulting in purchase of the product.