When UnitedHealth Group Inc. stayed away from a state's public health insurance exchange, the coverage sold through that exchange was more expensive.

Leemore Dafny, a management professor at Northwestern University, and two colleagues reported that observation in a paper published behind a paywall on the website of the National Bureau of Economic Research.

One of the co-authors, Jonathan Gruber, helped shape the closely watched public exchange in Massachusetts.

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Allison Bell

Allison Bell, a senior reporter at ThinkAdvisor and BenefitsPRO, previously was an associate editor at National Underwriter Life & Health. She has a bachelor's degree in economics from Washington University in St. Louis and a master's degree in journalism from the Medill School of Journalism at Northwestern University. She can be reached through X at @Think_Allison.