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正确的投资决策来源于对投资项目的技术经济分析。技术经济分析的方法很多，而最受西方投资者所偏爱的莫过于净现值法。净现值、就是投资项目在考察期内的现金流量（包括投资在内），以选定的投资收益率（K）贴现后的代数和。用NPV表示，其计算公式为：式中Ct－t年的净现金流量
The right investment decision comes from the technical and economic analysis of the investment project. There are many ways of technical and economic analysis, but the most popular Western investors prefer the NPV method. The NPV is the sum of the algebra after discounting the selected investment return (K) using the cash flow (including investment) of the investment during the inspection period. NPV, which is calculated as: where Ct-t net cash flow