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Academic Journal of Business & Management, 2021, 3(2); doi: 10.25236/AJBM.2021.030207.

On Misunderstandings in Project Economic Evaluation Theory


Gu Zheng, Gao Jing, Yang Bo

Corresponding Author:
Gu Zheng

State Grid Liaoning Electric Power CO, LTD. Power Electric Research Institute, Shenyang, Liaoning, 110015, China


This article proves that IRR does not conform to the economic meaning of marginal income from the perspective of theory and practical application. Only the net present value rate NPVR and the net investment return rate N/K conform to the economic meaning of marginal income. This also theoretically explains why the use of IRR sorting cannot guarantee the optimal portfolio of selected projects when funding constraints do not cut projects. Therefore, the use of index rankings other than NPVR or N/K lacks theoretical basis and can only be an approximate method in practical applications.


Marginal income; internal rate of return; net present value rate; net investment rate of return; capital constraints

Cite This Paper

Gu Zheng, Gao Jing, Yang Bo. On Misunderstandings in Project Economic Evaluation Theory. Academic Journal of Business & Management (2021) Vol. 3, Issue 2: 34-37. https://doi.org/10.25236/AJBM.2021.030207.


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