How to Say "self-interest" in Spanish
The most common Spanish word for “self-interest” is “interés” — use 'interés' when referring to personal advantage, motivation, or a stake in something, especially when it implies a lack of consideration for others..
interés
Examples
Actuó únicamente por su propio interés, sin pensar en los demás.
He acted solely out of self-interest, without thinking of others.
conveniencia
/con-ve-nyen-sya//kombeˈnjensja/

Examples
Ellos son amigos solo por conveniencia.
They are friends only for self-interest.
Fue un matrimonio de conveniencia.
It was a marriage of convenience.
A veces la gente actúa por pura conveniencia personal.
Sometimes people act out of pure personal advantage.
Using 'de' for Purpose
When you want to say why something exists (like a type of marriage), use 'de' + conveniencia.
Negative Nuance
In this context, the word often carries a slightly negative feeling, implying the person is being a bit selfish or cold.
Interest vs. Convenience
Mistake: “Saying 'por mi interés' when you mean it's convenient for you.”
Correction: Use 'por mi conveniencia' when it makes your life easier, and 'por mi propio interés' when you gain a specific selfish advantage.
Choosing Between 'Interés' and 'Conveniencia'
Related Translations
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