# Equilibrium

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The word equilibrium refers, among other things, to concepts of game theory. The most well-known equilibrium in game theory is the Nash equilibrium.

**Nash equilibria** are situations where each player has chosen a strategy and no single player could improve his situation by unilaterally changing strategy while all the other players keep their strategies.

**Cabal equilibria** are situations where each player has chosen a strategy and no *subset of players* could simultaneously change behaviour (while those outside that subset keep their strategies) in a way that no player in that subset is worse off and at least one in the subset is better off.

All cabal equilibria are Nash equilibria but not vice versa.