We study how inertia interacts with market power and adverse selection in managed competition health insurance markets. We use consumer-level data to estimate a model of the California ACA exchange, in which four firms dominate the market and risk adjustment is in place to manage selection. We...

Publicly subsidized private health insurance markets in the United States were created under the assumption that competition would maximize consumer welfare. However, consumers in these markets are willing to pay thousands of dollars to stay in the same health plan, even after accounting for...

I evaluate the accuracy of people's subjective probability expectations for using various health services. Subjective expectations closely reflect patterns of observed utilization, are predicted by the same covariates as observed utilization, and correlate with objective measures of risk. At the...

Die derzeit aufkeimende Systemkritik am deutschen Gesundheitswesen suggeriert, dass die zur unmittelbaren Gefahrenabwehr notwendige, von der Exekutive geprägte Steuerungslogik über die Krisenbewältigung hinaus zu vorteilhafteren Ergebnissen führe. Einfache Überlegungen und Indikatoren...

Recent healthcare reforms have sought to increase efficiency by introducing managed care (MC) while respecting consumer preferences by admitting choice between MC and conventional care. This article proposes an institutional change designed to let German consumers choose between the two settings...

Risk adjustment is used in settings with uncertainty to make payments or allow comparisons of outcomes while controlling for exogenous risk factors that explain variations in the outcome of interest, such as spending, utilisation, quality or death. This article focuses on the conceptual and...

This paper analyzes how health insurance market concentration impacts the market structure of primary care physicians. In more concentrated insurance markets, physicians are found to work in larger practices and their practices are more likely to have a hospital with an ownership interest....

The separate identification of effects due to incentives, selection and preference heterogeneity in insurance markets is the topic of much debate. In this paper, we investigate the presence and variation in moral hazard across health care procedures. The key motivating hypothesis is the...

I demonstrate that to achieve dynamic efficiency, the optimal share of total surplus that a social payer should transfer to an innovating industry for a current asset depends on the marginal product of investment and the share of profits invested by the industry on the current asset and not on...

In this essay, we review the theory and evidence concerning selection in competitive health insurance markets and discuss the common policy tools used to address the problems it creates. We begin by outlining some important but often misunderstood differences between two types of conceptual...