Agents' valuations are interdependent if they depend on the signals of all agents. Previous literature has claimed that with interdependent valuations and multidimen-sional, but independent, signals, efficient auction design is impossible. This paper shows that, on the contrary, it is always...

This paper contrasts consumer choice under uncertain lifetimes with the behavior that would arise if each individual's lifetime were announced at birth. In a model that includes life insurance and excludes investments in human capital, the expected utility under uncertain lifetimes exceeds that...

A very general model with which many theories of oligopolistic behavior might be tested would be a useful tool for economists. In the first part of this paper a model is proposed for this role. The model is not developed in the fullest degree of generality, but is presented in the way most...