Self-interest
Self-interest generally refers to a focus on the needs or desires (interests) of one's self. Most times, actions that display self-interest are often performed without conscious knowing. A number of philosophical, psychological, and economic theories examine the role of self-interest in motivating human action. Individuals may have a self-serving bias towards their self-interest.
In psychology[edit]
Psychological concepts concerned with self-interest include psychological egoism, the view that humans are always motivated by self-interest and narcissism, which is an unhealthy self-absorption due to a disturbance in the sense of self.
In business, self interest focuses on actions or activities that are advantageous to an individual or organization. For a business or individual to survive and grow, a degree of self-interest is necessary. When there is too much focus on self-interest, the benefits of the group at large diminishes.