Answer:
decrease; increase
Step-by-step explanation:
Self-esteem: In psychology, the term "self-esteem" is described as an individual's complete sense of his or her personal value or self-worth. It refers to the proclivity of a person to like or appreciate oneself. It is often referred to as an individual's personality traits that signify the fact that it is considered as enduring and stable. Therefore, self-esteem is considered as important as it influences an individual's choices and decisions.
In the question above, if the person compares oneself with gold medalist then the person's self-esteem will decrease as he or she is at a lower level and vice-versa.