Rationalizability is a central concept in game theory. Since there may be many rationalizable strategies, applications commonly use refinements to obtain sharp predictions. In an important paper, Weinstein and Yildiz (2007) show that none of these refinements is robust to perturbations of...

Modern economics has largely ignored the issue of outright conflict as an alternative way of allocating goods, assuming instead the existence of well-defined property rights enforced by an undefined third party. And yet even in ostensibly peaceful market transactions, conflict exists as an...