\begin{definition}[Definition:Pareto Efficiency]
Let $N$ be a finite set.
Let $X \subseteq \R^N$ be a set.
{{explain|what does $\R^N$ mean in this context? This definition has been rendered verbatim from the source work and needs amplification.}}
Then $x \in X$ is '''Pareto efficient''' {{iff}} there exists no $y \in X$ for which $x_i < y_i$ for all $i \in N$.
{{NamedforDef|Vilfredo Federico Damaso Pareto|cat = Pareto}}
\end{definition}