Description: Accurate determination of the appropriate time to retire and replace a physical asset is important for large ensembles of such assets when taken as a whole, and concerns the fate of tens of trillions of dollars in assets, such as airplane engines, vehicles, or any other kind of physical asset susceptible to obsolescence. A decision model to accomplish this is derived using the concept of actuarial present value applied to an economic theory of cost minimization. Since this is a theory coupling investor wealth creation with the long-term optimization of the use of scarce resources, it can also be offered as an economic model relevant to sustainability.

Description: Obsolescence of physical assets and processes is a major component of operational risk for some companies. A simulation experiment shows that managers, who consider the retirement and replacement of individual assets in isolation, have rational incentives, due to risk aversion and uncertainty, to defer the replacement of assets past a time that is optimal from the perspective of the shareholder who owns the entire portfolio of such assets. This results in measurable wealth destruction, —and a demonstrable opportunity to significantly enhance a company’s value. A practical decision model for the replacement timing of fixed, physical assets, which creates wealth by minimizing the long-term consumption of scarce resources, is provided.