This paper discusses experimental design from an efficiency viewpoint. We interpret the design of social experiments as an economic intertemporal consumpion problem, as opposed to a statistical variance minimization problem, and contrast the difference between Pareto optimal sample size and...

This paper presnets first empirical results on moral hazard in demand for physician services, using a longitudinal dataset on 4578 individuals followed during two years. The data set contains two subgroups, one for which a copayment rate of 10% for physician visits was introduced in 1994, and an...