"The NPV uses the provision of assumption of the initial money to use. Too high capital assumption will hinder a good investment, and too low money will result in a suboptimal investment. In addition, the NPV method does not help compare two projects of different sizes because the size of the output depends on the size of the input." 

Is the meaning talking of value? Wwhat is your perspective of the NPV method when there are multiple projects under consideration with unequal life?