under different information scenarios. We investigate a situation with two types who vary only in their external marginal … information on the type of the contributor is available. Low types, on the other hand, contribute only more when they are aware of … the distribution of types, but have no information on the type of the contributor. …

The concept of Ambiguity designates those situations where the information available to the decision maker is …? The present paper fills these gaps. Specifically, it identifies those information structures that are incompatible with … information. These are used to give a formal definition of Ambiguity and, consequently, to distinguish between ambiguous and …

The concept of Ambiguity designates those situations where the information available to the decision maker is …? The present paper fi…lls these gaps. Speci…fically, it identifi…es those information structures that are incompatible with … information. These are used to give a formal de…finition of Ambiguity and, consequently, to distinguish between ambiguous and …

vary. The experiment implements two marginal return types, low and high, and uses the information that members have about … the heterogeneity to identify the applied contribution norm. We find that norms vary with the information environment. If …. Our results underline the importance of the information structure when persons with different abilities contribute to a …