A Bound of the Proportion of Pure Strategy Equilibria in Generic Games
In a generic ﬁnite normal form game with 2(α) + 1 Nash equilibria, at least alpha of the equilibria are nondegenerate mixed strategy equilibria (that is, they involve randomization by some players).
Gul, Faruk; Pearce, David G.; and Stacchetti, Ennio, "A Bound of the Proportion of Pure Strategy Equilibria in Generic Games" (1991). Cowles Foundation Discussion Papers. 1224.