[Solved] The marketplace isn't what it used to be. List and briefly discuss the new behaviors, opportunities, and challenges that await the marketer in the 21st century. Freud's Theory: A set of psychoanalytic theories developed by Sigmund Freud that focus on unconscious motives and conflicts, particularly those originating in childhood. Phallic Stage: The phallic stage is a concept in Freudian psychology referring to the period in early childhood when the libido (sexual energy) is concentrated in the genital area. Erotic Desires: Feelings of wanting or longing for sexual contact or relationships. Compensation: A strategy whereby one makes up for a deficiency in one area by excelling in another area.