title: Welfare effects of supplementary insurance: a comment.
mesh_terms: D004465:Economic Competition; D006801:Humans; D015271:Insurance Pools; D015273:Insurance Selection Bias; D007348:Insurance, Health / Q000191:economics*; D009313:National Health Programs / Q000191:economics*; D020379:Risk Adjustment; D012946:Social Welfare / Q000191:economics*