Adjective
(game theory, economics) Describing a situation in which the profit of one party cannot be increased without reducing the profit of another.
(game theory) Describing a strategy that cannot be made to perform better against one opposing strategy without performing less well against another.
Pareto-optimal (comparative more Pareto-optimal, superlative most Pareto-optimal)
Alternative form of Pareto optimal
Pareto-optimal
A society can be Pareto optimal and still perfectly disgusting. Amartya Sen
Since all of these choices are Pareto-optimal – no one's welfare can be improved without reducing the welfare of others – choice 4 would not be chosen, since there would always be other preferred choices. Source: Internet