This article describes the anatomy of health insurance. It begins by considering the optimal design of health insurance policies. Such policies must make tradeoffs appropriately between risk sharing on the one hand and agency problems such as moral hazard (the incentive of people to seek more...

This study assesses the factors influencing the movement of people across health plans. We distinguish three types of cost-related transitions: adverse selection, the movement of the less healthy to more generous plans; adverse retention, the tendency for people to stay where they are when they...

Proposition 2.5, a ballot initiative approved by Massachusetts voters in 1980 sharply reduced local property taxes and restricted their future growth. We examine the effects of Proposition 2.5 on municipal finances and assess voter satisfaction with these effects. We find that Proposition 2.5...

We examine why managed care plans are less expensive than traditional indemnity insurance plans. Our database consists of the insurance experiences of over 200,000 state and local employees in Massachusetts and their families, who are insured in a single pool. Within this group, average HMO...

This paper explores the relationship between the demographic characteristics of a community and the quantities of goods and services provided by its government We consider three models of public spending: a traditional "selfish" public choice model in which individuals care only about...

This study assesses the factors influencing the movement of people across health plans. We distinguish three types of cost-related transitions: adverse selection, the movement of the less healthy to more generous plans; adverse retention, the tendency for people to stay where they are when they...

Proposition 2.5, a ballot initiative approved by Massachusetts voters in 1980 sharply reduced local property taxes and restricted their future growth. We examine the effects of Proposition 2.5 on municipal finances and assess voter satisfaction with these effects. We find that Proposition 2.5...

Individual choice over health insurance policies may result in risk-based sorting across plans. Such adverse selection induces three types of losses: efficiency losses from individuals being allocated to the wrong plans; risk sharing losses since premium variability is increased; and losses from...

This paper examines the optimal design of insurance and reinsurance policies. We first consider reinsurance for catastrophes: risks which are large for any one insurer but not for the reinsurance market as a whole. Reinsurance for catastrophes is complicated by adverse selection. Optimal...

This paper explores the relationship between the demographic characteristics of a community and the quantities of goods and services provided by its government We consider three models of public spending: a traditional "selfish" public choice model in which individuals care only about...