Health markets may be inefficient because of poor information, and because of the adverse selection and moral hazard problems associated with health insurance.
由于信息贫乏，再加上健康保险出现的逆向选择和道德风险问题，保健市场可能是无效率的。
Gray theory is a new method for researching little data, uncertainty and poor information. It has features that are simple, easy to learn, high accuracy and feasibility. It is applied very broad.
灰色系统理论是一种研究少数据、贫信息不确定性问题的新方法，它有着简便、易学、准确性和可行性高的特点，因此应用领域十分宽广。
Gray theory is a new method for researching little data, uncertainty and poor information. It has features that are simple, easy to learn, high accuracy and feasibility. It is applied very broad.
灰色系统理论是一种研究少数据、贫信息不确定性问题的新方法，它有着简便、易学、准确性和可行性高的特点，因此应用领域十分宽广。
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