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What Does a Deductible Do? The Impact of Cost-Sharing on Health Care Prices, Quantities, and Spending Dynamics

Zarek Brot-Goldberg (), Amitabh Chandra, Benjamin R. Handel and Jonathan T. Kolstad
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Amitabh Chandra: Harvard University
Benjamin R. Handel: University of CA, Berkeley
Jonathan T. Kolstad: University of CA, Berkeley

Working Paper Series from Harvard University, John F. Kennedy School of Government

Abstract: Measuring consumer responsiveness to medical care prices is a central issue in health economics and a key ingredient in the optimal design and regulation of health insurance markets. We study consumer responsiveness to medical care prices, leveraging a natural experiment that occurred at a large self-insured firm which forced all of its employees to switch from an insurance plan that provided free health care to a non-linear, high deductible plan. The switch caused a spending reduction between 11.79%-13.80% of total firm-wide health spending ($100 million lower spending per year). We decompose this spending reduction into the components of (i) consumer price shopping (ii) quantity reductions (iii) quantity substitutions, finding that spending reductions are entirely due to outright reductions in quantity. We find no evidence of consumers learning to price shop after two years in high-deductible coverage. Consumers reduce quantities across the spectrum of health care services, including potentially valuable care (e.g. preventive services) and potentially wasteful care (e.g. imaging services). We then leverage the unique data environment to study how consumers respond to the complex structure of the high-deductible contract. We find that consumers respond heavily to spot prices at the time of care, and reduce their spending by 42% when under the deductible, conditional on their true expected end-of-year shadow price and their prior year end-of-year marginal price. In the first-year post plan change, 90% of all spending reductions occur in months that consumers began under the deductible, with 49% of all reductions coming for the ex ante sickest half of consumers under the deductible, despite the fact that these consumers have quite low shadow prices. There is no evidence of learning to respond to the true shadow price in the second year post-switch.

New Economics Papers: this item is included in nep-hea and nep-ias
Date: 2015-10
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https://research.hks.harvard.edu/publications/getFile.aspx?Id=1265

Related works:
Journal Article: What does a Deductible Do? The Impact of Cost-Sharing on Health Care Prices, Quantities, and Spending Dynamics (2017) Downloads
Working Paper: What Does a Deductible Do? The Impact of Cost-Sharing on Health Care Prices, Quantities and Spending Dynamics (2016) Downloads
Working Paper: What Does a Deductible Do? The Impact of Cost-Sharing on Health Care Prices, Quantities, and Spending Dynamics (2015) Downloads
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Persistent link: https://EconPapers.repec.org/RePEc:ecl:harjfk:15-060

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