In game theory, the Nash Equilibrium, named after the mathematician John F Nash Jr. (of “A Brilliant Mind” film fame), is a proposed solution of a non-cooperative game involving two or more players in which each player is assumed to know the equilibrium strategies of the other players, and no player has anything to gain by changing only their own strategy. source
To this we can add that the observation that such an equilibrium is often sub-optimal for all players, but as noted in the description, no player has any incentive to change. Players are “locked in” to a sub-optimal outcome.
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