I study the implications of Abraham Wald's (1947) complete class theorem for decision making under Knightian uncertainty (or ambiguity). Suppose we call someone who uses Wald's approach to statistical decision making a Waldian. A Waldian may then have preferences over acts that are not in...

Die Präzision ökonomischer Prognosen und die Qualität politischer Handlungsempfehlungen hängen in entscheidendem Ausmaß von der Qualität des zugrunde liegenden Verhaltensmodells ab. Nur ein empirisch gut fundiertes Modell ökonomischen Handelns erlaubt es, die Konsequenzen politischer...

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...

Economic models and experiments frequently use lotteries with only a few outcomes. We provide a comprehensive analysis of the correlation between such lotteries as well as their dependence structure more generally. We fully characterize the joint distribution of two binary lotteries via their...

The present paper introduces a theoretical framework through which the degree of risk aversion with respect uncertain prices can be measured through the context of the indirect utility function (IUF) using a lab experiment. First, the paper introduces the main elements of the duality theory (DT)...

If a decision maker, in a world of uncertainty a la Anscombe and Aumann (1963), can choose acts according to some objective probability distribution (by throwing dice for instance) from any given set of acts, then there is no set of acts that allows an experimenter to test more than the Axiom of...

Evidence from studies in international relations, the politics of reform, collective action and price competition suggests that economic agents in social dilemma situations cooperate more to avoid losses than in the pursuit of gains. To test whether the prospect of losses can induce cooperation,...

We investigate the procedure of "random sampling" where the alternatives are random variables. When comparing any two alternatives, the decision maker samples each of the alternatives once and ranks them according to the comparison between the two realizations. Our main result is that when...

By means of examples that pertain to individual, family, and community contexts, it is shown that migration between locations is compatible with a zero expected net earnings differential between locations. The examples give rise to testable predictions that differ sharply from the predictions...

Large, macroeconomic shocks in the past have been shown to influence economic decisions in the present. We study in an experiment with 743 subjects whether small-scale, seemingly negligible, events also affect the formation of risk preferences. In line with a reinforcement learning model, we...