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Defining the payback period for nonconventional cash flows: an axiomatic approach

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  • Mikhail V. Sokolov

Abstract

The payback period is unambiguously defined for conventional investment projects, projects in which a series of cash outflows is followed by a series of cash inflows. Its definition for nonconventional projects is more challenging, since their balances (cumulative cash flow streams) may have multiple break-even points. Academics and practitioners offer a few contradictory recipes to manage this issue, suggesting to use the first break-even point of the balance, the last break-even point of the balance, or the break-even point of the modified cumulative cash flow stream, representing the moment of time in which the cumulative cash inflow exceeds the total cash outflow. In this note, we show that the last break-even point of the project balance is the only definition of the payback period consistent with a set of economically meaningful axioms. An analogous result is established for the discounted payback period.

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  • Mikhail V. Sokolov, 2025. "Defining the payback period for nonconventional cash flows: an axiomatic approach," Papers 2511.03568, arXiv.org.
    • Handle: RePEc:arx:papers:2511.03568
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    File URL: http://arxiv.org/pdf/2511.03568
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