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分析了现行经济评价方法中对物价变动处理存在的一些问题，论述了资金时间价值的两重性，按费用和收益的物价变动率相同和不同两种情况，推导了项目经济评价指标正确的计算方法，并指出了应注意的事项和应用的范围。
This paper analyzes some existing problems in the current economic appraisal methods for price changes, discusses the duality of the time value of the funds, deduces the correct calculation method of the project economic appraisal indicators according to the same and different price volatility of the cost and return, And pointed out the matters needing attention and the scope of the application.