Decision makers are frequently confronted with ambiguous risk information about activities with potential hazards. This may be a result of conflicting risk estimates from multiple sources or ambiguous risk information from a single source. The paper considers processing ambiguous risk...

The paper examines principal-agent relationships in uncertain environments where beliefs of the contracting parties (the regulator and the firm) are represented by sets of probabilities. In addition to fully characterizing the first-best and the second-best solutions, we examine optimality of...

Optimal trade policy in an uncertain world is examined. Decision-maker attitudes toward uncertainty are represented in terms of the Gilboa-Schmeidler (1989) maximin expected-utility (MMEU) model. The central result is that in a two-country, general-equilibrium setting with both trading partners...

This paper is about the strategy of retaining unobservably heterogeneous firms attracted by unobservably valued outside alternatives. We prove that differentiating taxation and public good fiscal packages within one's own locale dominates offering the same packages to all firms. We rationalize...