Final answer:
The self-expansion theory's two main premises are the motivation to improve oneself and the expansion of self-concept through close relationships.
Step-by-step explanation:
The two main premises of the self-expansion theory are first that individuals have a fundamental motivation to improve themselves and increase their abilities through personal development and relationships. Second, by forming close relationships, individuals can effectively expand their sense of self by including aspects of others in their own self-concept. This theory somewhat aligns with humanistic psychologists like Abraham Maslow and Carl Rogers who emphasized self-actualization, congruence between real and ideal self, and the human potential for growth. Self-expansion theory also takes into account the role of interpersonal relationships in self-development, a concept that is not central to Maslow’s and Rogers’s theories but is a key part of this theory.