然后分析了不同效用函数和两种剩余模式对决策的影响；
Third, this paper analyzes the effect of different utility function and two kinds of surplus modes to the decision- making.
我们的主要结论是：综合剩余模式的形状比较复杂，这种复杂性可能是人们难以认识和评估综合效益的部分原因。
The main results are: 1 the form of the comprehensive pattern of surplus CPS is complicated, which can partly explain the difficulty to evaluate the comprehensive benefit.
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