The 2003 Medicare Modernization Act introduced income-related premiums on Medicare coverage for professional services (Part B) for the first time. Beginning in 2007, higher-income households were required to pay higher premiums for Part B coverage, which raises the price of Medicare relative to employer-sponsored health insurance for these households. The authors exploit this exogenous change in Medicare policy to examine the impact of Part B premiums on the labor supply decisions of older adults. They find that higher Medicare premiums delay retirement. Findings have important implications for Medicare policy and labor markets.
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