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Do HMOs have monopsony power?
1Division of Health Services Research and Policy, University of Minnesota, 420 Delaware St, SE, Box 729, Minneapolis, MN 55455, USA. feldm002@tc.umn.edu
International Journal of Health Care Finance and Economics
|November 25, 2003
Summary
Health maintenance organizations (HMOs) do not appear to possess monopsony power in hospital markets. Their buying power influences hospital prices and utilization, but not ambulatory care markets.
Area of Science:
- Health Economics
- Market Analysis
- Healthcare Policy
Background:
- Health Maintenance Organizations (HMOs) are significant purchasers of healthcare services.
- Understanding market power dynamics is crucial for healthcare pricing and access.
- Previous research has explored the impact of managed care on healthcare markets.
Purpose of the Study:
- To investigate whether Health Maintenance Organizations (HMOs) exhibit monopsony power in ambulatory care and inpatient hospital service markets.
- To analyze the relationship between HMO market share and healthcare prices/utilization.
Main Methods:
- Utilized a pooled time-series analysis of US HMO data from 1985-1997.
- Linked InterStudy data with state regulatory financial data and Area Resource File characteristics.
- Employed a two-stage regression design to assess HMO buying power's effect on prices and utilization.
Main Results:
- Increased HMO buying power correlated with reduced prices and increased utilization for inpatient hospital services.
- No significant relationship was found between HMO buying power and ambulatory visit prices or utilization per member.
Conclusions:
- Findings do not support the monopsony hypothesis for HMOs in hospital markets.
- HMOs may have facilitated a welfare-enhancing reduction in hospital monopoly power.
- The impact of HMO buying power on ambulatory care markets is complex and requires further investigation.