Nash Equilibrium
Also called: Nash, equilibrium strategy
A Nash equilibrium is a set of strategies where nobody can do better by changing their own move alone. It is not necessarily the best outcome available — the prisoner's dilemma's equilibrium is worse for both players than cooperating. That gap between stable and good is exactly why bank runs, price wars and arms races persist: each participant is behaving rationally given everyone else.
Where this is taught
Definitions are the trailer. These free levels turn Nash Equilibrium into something you play — one bite-size lesson, with worked examples, a quiz and XP.