The theoretical literature has found that advantageous selection could be observed in equilibrium when there is multi-dimensional heterogeneity of customers or both hidden action and hidden information are employed. This paper proposes a third approach for advantageous selection. Based on the classic Rothschild and Stiglitz (1976) model, we consider ambiguity-averse individuals who face a gener...

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A reconsideration of the Pigovian theory of regulating externalities via taxation is undertaken for environments with private information. The presence of private information may have no effect on the social optimum; but when it has an impact, it is to cause a group of different agents to share the same production or consumption levels. The model developed provides an appealing characterization...

This is a preliminary and incomplete version of a manuscript to be prepared for the CIME-EMS Summer School on Stochastic Methods in Finance, July, 2003. Please do not quote or distribute.