The conventional model for the use of cost effectiveness analysis for health programs involves determining whether the cost per unit of effectiveness of the program is better than some socially determined maximum acceptable cost per unit of effectiveness. If a program is better, the policy...

This informal paper explores models of competitve insurance market equilibrium when individuals of initially similar apparent risk experience divergence in risk levels over time. The information structrue is modeled in three alternative ways: all insurers and insureds know risk at any point in...