Vague, or imprecise, news may affect decisions by changing either the fundamentals, or the associated uncertainty, or both. We show response to vague news is shaped by ambiguity attitudes, yet with qualitative differences for different levels of risk, on top of ambiguity, conveyed. The decision...

If players' beliefs are strictly nonadditive, the Dempster-Shafer updating rule can be used to define beliefs off the equilibrium path. We define an equilibrium concept in sequential two-person games where players update their beliefs with the Dempster-Shafer updating rule. We show that in the...