the net present value criterion

Maximum net present value criterion — Resources should be allocated to those USES which maximize the value if the net benefits received from all possible USES of those resource.

最大净现值标准——资源应该分配成具有利用最大价值，如果从所有可能利用的资源中收获净效益。

Cost-benefit ratio criterion----No activity where the present value of net benefits is less than zero should be taken.

成本效益分比率准则——净利润现值低于零的无活力地区应该被承揽。

Positive net present value criterion — This criterion requires the present value of benefit to be larger than the present value of costs for any project that is to be undertaken.

正净现值标准—这个标准要求收益限制比任何已经投产的项目成本的现值大。