The geography of health insurance regulation.

The health insurance market consists of three distinct segments--individual, small group, and large group--each governed by different economic and regulatory structures. A number of border-crossing techniques have arisen for avoiding the burdens of one segment and capitalizing on the benefits of others. Drawing from extensive qualitative research into the functioning of existing market structures, this paper describes these techniques and their purposes and effects. This road map helps to identify which reform proposals seek to produce true economic efficiencies and which have the potential to undermine previous reform objectives.