NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

NBER Working Papers by Roger Feldman

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Working Papers

December 2013Going into the Affordable Care Act: Measuring the Size, Structure and Performance of the Individual and Small Group Markets for Health Insurance
with Pinar Karaca-Mandic, Jean M. Abraham, Kosali Simon, Roger Feldman: w19719
The Affordable Care Act (ACA) will dramatically alter health insurance markets and the sources through which individuals obtain coverage. As the ACA is implemented, it is essential to monitor the intended and the unintended consequences of these regulations. To evaluate the changes in health insurance markets linked to the ACA, it is critical to consistently measure the size and structure of health insurance markets, as well as the performance of participating health insurers, prior to and post-ACA. In this paper we discuss challenges of describing the size, structure, and performance of the individual and small group markets. Next, we discuss improvements in data availability starting in 2010 to address some of these concerns. Finally, using data from the National Association of Insurance...
August 2013The Role of Agents and Brokers in the Market for Health Insurance
with Pinar Karaca-Mandic, Roger Feldman, Peter Graven: w19342
Health insurance markets in the United States are characterized by imperfect information, complex products, and substantial search frictions. Insurance agents and brokers play a significant role in helping employers navigate these problems. However, little is known about the relation between the structure of the agent/broker market and access and affordability of insurance. This paper aims to fill this gap by investigating the influence of agents/brokers on health insurance decisions of small firms, which are particularly vulnerable to problems of financing health insurance. Using a unique membership database from the National Association of Health Underwriters together with a nationally representative survey of employers, we find that small firms in more competitive agent/broker markets a...
May 2006The Welfare Consequences of Hospital Mergers
with Robert Town, Douglas Wholey, Roger Feldman, Lawton R. Burns: w12244
In the 1990s the US hospital industry consolidated. This paper estimates the impact of the wave of hospital mergers on welfare focusing on the impact on consumer surplus for the under-65 population. For the purposes of quantifying the price impact of consolidations, hospitals are modeled as an input to the production of health insurance for the under-65 population. The estimates indicate that the aggregate magnitude of the impact of hospital mergers is modest but not trivial. In 2001, average HMO premiums are estimated to be 3.2% higher than they would have been absent any hospital merger activity during the 1990s. In 2003, we estimate that because of hospital mergers private insurance rolls declined by approximately .3 percentage points or approximately 695,000 lives with the vast majorit...
January 2005Did the HMO Revolution Cause Hospital Consolidation?
with Robert Town, Douglas Wholey, Roger Feldman, Lawton R. Burns: w11087
During the 1990s US healthcare markets underwent a significant transformation. Managed care rose to become the dominant form of insurance in the private sector. Also, a wave of hospital consolidation occurred. In 1990, the mean population-weighted hospital Herfindahl-Hirschman Index (HHI) in a Health Services Area (HSA) was .19. By 2000, the HHI had risen to .26. This paper explores whether the rise in managed care caused the increase in hospital concentration. We use an instrumental variables approach with 10-year differences to identify the relationship between managed care penetration and hospital consolidation. Our results strongly imply that the rise of managed care did not cause the hospital consolidation wave. This finding is robust to a number of different specifications.

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