NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Martin B. Hackmann

Department of Economics
University of California, Los Angeles
8283 Bunche Hall
Los Angeles, CA 90095
Tel: 203/298-2916

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NBER Program Affiliations: HC
NBER Affiliation: Faculty Research Fellow

NBER Working Papers and Publications

November 2017Medicaid and Financial Health
with Kenneth Brevoort, Daniel Grodzicki: w24002
This paper investigates the effects of the Medicaid expansion provision of the Affordable Care Act (ACA) on households' financial health. Our findings indicate that, in addition to reducing the incidence of unpaid medical bills, the reform provided substantial indirect financial benefits to households. Using a nationally representative panel of 5 million credit records, we find that the expansion reduced unpaid medical bills sent to collection by $3.4 billion in its first two years, prevented new delinquencies, and improved credit scores. Using data on credit offers and pricing, we document that improvements in households' financial health led to better terms for available credit valued at $520 million per year. We calculate that the financial benefits of Medicaid double when considering...
February 2017The Returns to Nursing: Evidence from a Parental Leave Program
with Benjamin U. Friedrich: w23174
Nurses comprise the largest health profession. In this paper, we measure the effect of nurses on health care delivery and patient health outcomes across sectors. Our empirical strategy takes advantage of a parental leave program, which led to a sudden, unintended, and persistent 12% reduction in nurse employment. Our findings indicate detrimental effects on hospital care delivery as indicated by an increase in 30-day readmission rates and a distortion of technology utilization. The effects for nursing home care are more drastic. We estimate a persistent 13% increase in nursing home mortality among the elderly aged 85 and older. Our results also highlight an unintended negative consequence of parental leave programs borne by providers and patients.
June 2013Adverse Selection and an Individual Mandate: When Theory Meets Practice
with Jonathan T. Kolstad, Amanda E. Kowalski: w19149
We develop a model of selection that incorporates a key element of recent health reforms: an individual mandate. We identify a set of key parameters for welfare analysis, allowing us to model the welfare impact of the actual policy as well as to estimate the socially optimal penalty level. Using data from Massachusetts, we estimate the key parameters of the model. We compare health insurance coverage, premiums, and insurer average health claim expenditures between Massachusetts and other states in the periods before and after the passage of Massachusetts health reform. In the individual market for health insurance, we find that premiums and average costs decreased significantly in response to the individual mandate; consistent with an initially adversely selected insurance market. We are ...

Published: Martin B. Hackmann & Jonathan T. Kolstad & Amanda E. Kowalski, 2015. "Adverse Selection and an Individual Mandate: When Theory Meets Practice," American Economic Review, American Economic Association, vol. 105(3), pages 1030-66, March. citation courtesy of

January 2012Health Reform, Health Insurance, and Selection: Estimating Selection into Health Insurance Using the Massachusetts Health Reform
with Jonathan T. Kolstad, Amanda E. Kowalski: w17748
We implement an empirical test for selection into health insurance using changes in coverage induced by the introduction of mandated health insurance in Massachusetts. Our test examines changes in the cost of the newly insured relative to those who were insured prior to the reform. We find that counties with larger increases in insurance coverage over the reform period face the smallest increase in average hospital costs for the insured population, consistent with adverse selection into insurance before the reform. Additional results, incorporating cross-state variation and data on health measures, provide further evidence for adverse selection.

Published: Martin B. Hackmann & Jonathan T. Kolstad & Amanda E. Kowalski, 2012. "Health Reform, Health Insurance, and Selection: Estimating Selection into Health Insurance Using the Massachusetts Health Reform," American Economic Review, American Economic Association, vol. 102(3), pages 498-501, May. citation courtesy of

 
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