Health Insurance Reform and HMO Penetration in the Small Group Market
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NBER Working Paper No. 11446
Issued in June 2005
NBER Program(s): HC
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We use data from several national employer surveys conducted between the late 1980s and the mid-1990s to investigate the effect of state-level underwriting reforms on HMO penetration in the small-group health insurance market. We identify reform effects by exploiting cross-state variation in the timing and content of reform legislation and by using mid-sized and large employers, which were not affected by the legislation, as within-state control groups. While it is difficult to disentangle the effect of state reforms from other factors affecting HMO penetration in the small group markets, the results suggest a positive relationship between insurance market regulations and HMO penetration.
Published: Buchmueller, Thomas C. and Su Liu. “Health Insurance Reform and HMO Penetration in the Small Group Market.” Inquiry 42, 4 (Winter 2005/2006).
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