Replacement chain approach

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Replacement chain approach (alternatively known as common life approach) is a method of comparing mutually exclusive projects that have unequal lives. Each project is replicated so that they will both terminate in a common year. If projects with lives of 3 years and 5 years are being evaluated, then the 3-year project would be replicated 5 times and the 5-year project replicated 3 times; thus, both projects would terminate in 15 years.


Definitions

According to Financial Management Theory and Practice by Eugene F. Brigham and Michael C. Ehrhardt (13th edition),

Replacement chain approach (common life approach). A method of comparing mutually exclusive projects that have unequal lives. Each project is replicated so that they will both terminate in a common year. If projects with lives of 3 years and 5 years are being evaluated, then the 3-year project would be replicated 5 times and the 5-year project replicated 3 times; thus, both projects would terminate in 15 years.

According to Fundamentals of Financial Management by Eugene F. Brigham and Joel F. Houston (15th edition),

Replacement chain approach (common life approach). A method of comparing projects with unequal lives that assumes that each project can be repeated as many times as necessary to reach a common life. The NPVs over this life are then compared, and the project with the higher common-life NPV is chosen.

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