NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

NBER Publications by Martin Hackmann

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Working Papers and Chapters

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 ...
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.

Contact and additional information for this authorAll papers and publicationsWorking Papers onlyWorking Papers with publication info

 
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