Pareto efficiency is a welfare economics concept. In game theory, the closest you can get to that is a Nash equilibrium.
Pareto optimal is definitely a core concept in game theory. It says that no other vector beats it in every dimension (or at least as good in all but one, and better in at least one).
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Pareto optimal is definitely a core concept in game theory. It says that no other vector beats it in every dimension (or at least as good in all but one, and better in at least one).