This paper is a substantially revised and extended version of a preliminary paper presented at the 1993 ARIA Meeting in San Francisco. This research was funded in part by the National Association of Insurance Commissioners. The conclusions expressed here are the authors' and do not necessarily reflect the opinion of the National Association of Insurance Commissioners. Introduction The National ...

We consider the consequences of narrow medical provider networks—offered by insurers on health care exchanges and employer-sponsored insurance markets—for inequality and welfare. We first describe current and proposed approaches to network regulation and propose a model of the health care market that can be used to evaluate the likely effects of these and other market design policies. The model...