The New Cooperative Medical Scheme adopts a principle of voluntarism for Chinese peasants enrolment, facing a predicament of adverse selection.

• 新型农村合作医疗采取了自愿参与的原则,遭受逆向选择问题的困扰。从患病概率和成本看,农民有参加新型农村合作医疗的客观需求。