One unusual feature of the U.S. property-casualty insurance industry is the coexistence of stock and mutual companies. This paper explores the performance of these forms in the industry through a dynamic assessment of how mutual and stock insurance companies respond to differences in their...

This research examines the cost structure of a nationally representative sample of HMOs from 1991-1994 to determine whether cost savings achieved through enrollment growth and age of the plan are shared with any of the factors of production. The data are obtained from Health Care Investment...

Whereas the literature evaluating the effect of tort reforms has focused on reported incurred losses, this paper examines the long run effects using a comprehensive sample by state of individual firms writing medical malpractice insurance from 1984-2003. The long run effects of reforms are...

Natural catastrophes often have catastrophic risks on insurance companies as well as on the insured. Using a very large dataset on homeowners%u2019 insurance coverage by state, by firm, and by year for the 1984 to 2004 period, this paper documents the positive effect on losses and loss ratios of...