Net present value (NPV), benefit: cost ratio (BCR), and internal rate of return (IRR) are fundamental concepts of benefit-cost analysis (BCA), providing helpful criteria for decision making about investments. However, textbooks on BCA are remarkably inconsistent in the advice they provide about which of these decision criteria should be used, potentially creating confusion among teachers and students. We present an existing conceptual framework that clarifies which of the three criteria should be used in particular decision contexts, depending on whether the projects in question are independent or mutually exclusive, and on whether the projects are resourced from a fixed pool of funds. The framework reveals that some of the advice provided by particular textbooks is incorrect, and some is correct only in certain decision contexts. Some books dismiss the use of BCR in general, but we show that it is the preferred criterion in certain cases and clarify how it should be calculated. The argument that BCRs can be manipulated by moving costs between the denominator and the numerator is fallacious. Recognizing that these decision criteria should not be applied mechanistically, we argue that the framework presented has the potential to improve decision making in many cases.

Abelson, P. 1979. Cost Benefit Analysis and Environmental Problems. Farnborough UK: Saxon House.

Asian Development Bank. 2013. Cost-Benefit Analysis for Development: A Practical Guide. Manilla, Philippines.

Bain, J.S. 1960. “Criteria for Undertaking Water-Resource Development.” American Economic Review 50(2):310–320.

Bergstrom, J.C., and A. Randall. 2016. Resource Economics: An Economic Approach to Natural Resource and Environmental Policy, 4th ed. Northampton MA: Edward Elgar.

Bey, R.P. 1998. “Multiple Internal Rates of Return: A Graphical Analysis.” Journal of Financial Education 24:84–89.

Boardman, A., D. Greenberg, A. Vining, and D. Weimer. 2018. Cost-Benefit Analysis: Concepts and Practice, 5th ed. Cambridge UK: Cambridge University Press.

Brent, R.J. 1998. Cost-Benefit Analysis for Developing Countries. Northampton MA: Edward Elgar.

Brent, R.J. 2003. Cost-Benefit Analysis and Health Care Evaluations. Northampton MA: Edward Elgar.

Brent, R.J. 2017. Advanced Introduction to Cost-Benefit Analysis. Northampton MA: Edward Elgar.

Campbell, H., and R. Brown. 2016. Cost-Benefit Analysis: Financial and Economic Appraisal Using Spreadsheets, 2nd ed. New York: Routledge.

Commonwealth of Australia 2006. Handbook of Cost Benefit Analysis. Canberra.

de Rus, G. 2021. Introduction to Cost-Benefit Analysis: Looking for Reasonable Shortcuts, 2nd ed. Northampton MA: Edward Elgar.

Dinwiddy, C., and F. Teal. 1996. Principles of Cost-Benefit Analysis for Developing Countries. Cambridge UK: Cambridge University Press.

Dryden, M.M. 1962. “Capital Budgeting: Treatment of Uncertainty and Investment Criteria.” Scottish Journal of Political Economy 9(3):235–259.

Fuguitt, D., and S.J. Wilcox. 1999. Cost-Benefit Analysis for Public Sector Decision Makers. Westport CT: Quorum.

Gittinger, J.P. 1972. Economic Analysis of Agricultural Projects, 2nd ed. Baltimore MD: Johns Hopkins University Press.

Gramlich, E.M. 1990. A Guide to Benefit-Cost Analysis, 2nd ed. Englewood Cliffs NJ: Prentice-Hall.

Hanley, N., and E.B. Barbier. 2009. Pricing Nature: Cost-Benefit Analysis and Environmental Policy. Northampton MA: Edward Elgar.

Hazen, G.B. 2003. “A New Perspective on Multiple Internal Rates of Return.” The Engineering Economist 48(1):31–51.

Hirshleifer, J. 1958. “On the Theory of Optimal Investment Decisions.” Journal of Political Economy 66(4):329–352.

HM Treasury. 2022. The Green Book: Central Government Guidance on Appraisal and Evaluation. London.

Hoskins, C.G. 1974. “Benefit-Cost Ratios and Net Present Value: Revisited.” Journal of Business Finance and Accounting 1(2):249–265.

Johansson, P., and B. Kriström. 2015. Cost–Benefit Analysis for Project Appraisal. Cambridge UK: Cambridge University Press.

Layard, P.R.G., and S. Glaister. 1994. Cost Benefit Analysis, 2nd ed. Cambridge UK: Cambridge University Press.

Lorie, J.H., and L.J. Savage. 1955. “Three Problems in Rationing Capital.” Journal of Business 28(4):229–239.

Lund, J.R. 1992. “Benefit-Cost Ratios: Failures and Alternatives.” Journal of Water Resource Planning and Management 118(1):94–100.

Marglin, S.A. 1967. Public Investment Criteria: Benefit-Cost Analysis for Planned Economic Growth. London: Allen and Unwin.

Nas, T.F. 2018. Cost-Benefit Analysis: Theory and Application, 2nd ed. Thousand Oaks, CA: Sage Publications.

Pearce, D.W. 1983. Cost-Benefit Analysis, 2nd ed. London: Macmillan.

Pearce, D., G. Atkinson, and S. Mourato. 2006. Cost-Benefit Analysis and the Environment: Recent Developments. Paris: OECD.

Prest, A.R., and R. Turvey. 1965. “Cost-Benefit Analysis: A Survey.” The Economic Journal 75(300):683–735.

Ray, A. 1984. Cost-Benefit Analysis: Issues and Methodologies. Baltimore MD: Johns Hopkins University Press.

Renshaw, E. 1957. “A Note on the Arithmetic of Capital Budgeting Decisions.” The Journal of Business 30(3):193–201.

Rosbaco, J.A. 1999. “Multiple Internal Rates of Return—When to Anticipate Multiple IRRs and How to Take Advantage of Them to Perform a Better Evaluation.” SPE-53768-MS. Paper presented at the Latin American and Caribbean Petroleum Engineering Conference, Caracas, Venezuela, April. https://doi.org/10.2118/53768-MS

Schwab, B., and P. Lusztig. 1969. “A Comparative Analysis of the Net Present Value and the Benefit-Cost Ratio as Measures of the Economic Desirability of Investments.” Journal of Finance 24:507–516.

U.S. Environmental Protection Agency. 2010. Guidelines for Preparing Economic Analysis. Washington DC.