Further Discussion on the Reason of the Conflict Between NPV and IRR

In allusion to the reason of the conflict between NPV and IRR,this paper thinks reinvestment rate theory can't explain it well.The reason of the conflict between NPV and IRR is that the two indexes can not always assure their monotone increasing relation and the definition formulas of two indexes themselves determine their conflict,but not other reasons.Finally the paper gives the self-consistency condition of investment projects' NPV and IRR.The condition is that the NPV function images of different projects bigger than zero do not intersect.