Self-interest (noun)

1. Noun: concern with one's own well-being or advantage.
2. Noun: actions or decisions motivated by personal benefit or gain.
3. Noun: the belief that people act primarily in pursuit of their own self-interest.

Origin:

Compound noun, "self" meaning "oneself" and "interest" meaning "concern".

Examples:

1. He acted in his own self-interest, rather than considering the needs of others.
2. Self-interest is often considered a driving force in human behavior.
3. Self-interest is not always a bad thing, but it's important to balance it with the needs of others.
4. The company's decision to cut costs was driven by self-interest rather than a concern for their employees.
5. Self-interest led many people to vote for the candidate who promised them the most benefits.