Abstract: We examine some economic impacts of hospital admissions using an event study approach in two datasets: survey data from the Health and Retirement Study, and hospital admissions data linked to consumer credit reports. We report estimates of the impact of hospital admissions on out-of-pocket medical spending, unpaid medical bills, bankruptcy, earnings, income (and its components), access to credit, and consumer borrowing. The results point to three primary conclusions: non-elderly adults with health insurance still face considerable exposure to uninsured earnings risk; a large share of the incremental risk exposure for uninsured non-elderly adults is borne by third parties who absorb their unpaid medical bills; the elderly face very little economic risk from adverse health shocks.
Beyond Statistics: The Economic Content of Risk Scores (with Liran Einav, Amy Finkelstein, and Paul Schrimpf) American Economic Journal: Applied Economics 8(2), April 2016: 195-224.
Abstract: In recent years, the increased use of “big data” and statistical techniques to score potential transactions has transformed the operation of insurance and credit markets. In this paper, we observe that these widely-used scores are statistical objects that constitute a one-dimensional summary of a potentially much richer heterogeneity, some of which may be endogenous to the specific context in which they are applied. We demonstrate this point empirically using rich data from the Medicare Part D prescription drug insurance program. We show that the “risk scores,” which are designed to predict an individual's drug spending and are used by Medicare to customize reimbursement rates to private insurers, do not distinguish between two different sources of spending: underlying health, and responsiveness of drug spending to the insurance contract. Naturally, however, these two determinants of spending have very different implications when trying to predict counterfactual spending under alternative contracts. As a result, we illustrate that once we enrich the theoretical framework to allow individuals to have heterogeneous behavioral responses to the contract, strategic incentives for cream skimming still exist, even in the presence of “perfect” risk scoring under a given contract.
Abstract: Behavioral frictions in insurance exchanges affect not only the plan a consumer selects, but also the menu of plans insurers offer. We investigate an information friction in Medicare Advantage—beneficiaries pay two premiums, and one is much more salient. We find a larger demand elasticity for the salient versus non-salient premium. A model of insurer plan design produces simulated premiums matching the observed distribution using these “behavioral” elasticities, but not when assuming equal elasticities across the two premiums. Removing the friction increases enrollment in low-premium plans, increasing consumer surplus $5/year with supply fixed and $73/year when including a supply response.