gametheory101.com/courses/game-theory-101/
An outcome is Pareto efficient if there is no other outcome that gives at least one player a greater payoff while giving no other player a worse payoff. An outcome is Pareto inefficient if there is at least one other outcome that gives at least one player a greater payoff while giving no other player a worse payoff.
Because expected utility transformations render interpersonal utility comparisons meaningless, Pareto efficiency is the standard measure of efficiency in game theory and economics.
