A. A state where each player is doing the best it can, given the strategies of all other players B. A state where the sum of all payoffs is maximized C. A state where the players always have achieved their best possible result D. A state at which MR = MC for a firm E. A state where each player always must play a dominant strategy
The Nash equilibrium is a concept of game theory. This is a theory in which the optimal outcome of a game is one where no player has an incentive to deviate from his or her original chosen strategy after considering an oponent's choice. This concept is named after the mathematician that invented it, John Nash.In this game state each player must be doing the best that they can given the strategies of all the other players.
Mathematically if a game is truly played using the Nash equilibrium it will come out as perfectly as possible according to the rules that are applied to every game.