Academicians have demonstrated the superiority of the Net Present Value (NPV) method for capital budgeting decisions for the value maximizer. Unfortunately, practitioners do not exhibit the same fervor for theoretical purity that academics do. Specifically, numerous surveys of capital budgeting practices show that the most commonly used discounted cashflow (DCF) method among practitioners is the Internal Rate of Return (IRR). Theorists have shown that the IRR is an accurate method for typical capital budgeting cases, giving proper accept or reject solutions; nevertheless, in some cases the IRR solution is inferior to the NPV solution. Thus, theorists favor the NPV in research and class endeavors. Yet, decision makers tend to ignore the plea of NPV's higher level o f "rigor" in favor of the IRR's "more intuitive appeal."Because o f the exceptional cases and perhaps to bring academicians and practitioners closer, many have undertaken to improve the IRR by creating various DCF methods that give answers in the form of yields. Not all of these creations have met the demands of logical consistency; not all have had clear focus on what one must do to make a rational capital budgeting decision; and most have too much of an ad hoc flair to be considered legitimate pedagogically. Many of these new methods are not in the finance literature and thus may have escaped notice; therefore, a critical review of some of these methods is the second section of the paper.The criticisms of existing yield-based methods are based on a theoretical framework for NPV, set up in the paper's first section as a standard for comparison of other models presented. Then assumptions are relaxed to accommodate pragmatic decision-making. This is done to demonstrate how NPV and yield-based methods deal with the changed environment. The third section is the paper's primary purpose. It sets forth eight criteria essential for a yield-based DCF methods to be a valid substitute for NPV. These criteria require that the yield-based method:
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6.7. 8.gives the same accept/reject decision as NPV for every project; maintains risk-equivalence with the firm's typical operations so that it may be compared to the marginal cost of capital; is consistent with the idea that in the long run the marginal return on projects approaches equilibrium with the marginal cost of capital; includes the idea that capital funds are different from operational cashfl ows ; gives a unique solution for every project; ranks projects of unequal size in the same order as NPV; ranks projects having time disparity in the same order as NPV; and ranks projects having unequal lives in the same order as NPV.Finally, the paper defines a yield-based method that meets seven of these criteria. Formal proofs demonstrating the consistency with each criterion are given where necessary. The paper demonstrates the logical inconsistency and conceptual impossibility of any yield-based method discriminating among projects of different sizes.