IRR internal rate of return ( ). , (). , , .
(Internal Rate of Return IRR) , , , , .. NPV (r =IRR)=0.
NPV net present value - - (Net Present Value NPV) , , .
. . , , . , . IRR , .
" " . "" . "" , .
(Profitability Index PI) . , , () .
(PP payback period) , .
(DPP discount payback period) .
(DPP discount payback period) .
, . .
, :
- NPV>=0
- IRR>= r , IRR NPV=0
- PI>=1
- t < T
IRR PI t.