The example shows that the method reflects the influences of all kinds of factors on the optimal level value objectively, and has better applied value.

实例表明，这种方法更加客观地反映了各种模糊因素对最优水平值的影响，具有较好的应用价值。

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It may be that charities' income and outputs are around their optimal level, and that the value added would fall as their income, and therefore their costs, rose.

ECONOMIST: Charities