Carmona, Guilherme - In: Journal of Economic Theory 144 (2009) 3, pp. 1333-1340
We introduce a notion of upper semicontinuity, weak upper semicontinuity, and show that it, together with a weak form of payoff security, is enough to guarantee the existence of Nash equilibria in compact, quasiconcave normal form games. We show that our result generalizes the pure strategy...