“…Several studies have investigated theoretically a setup for the relationship between endogenously determined depreciation and the optimal maintenance level, under which the central decision of the firm involves the allocation of expenditures between “new” investment and maintenance, in order to maximize the discounted value of future income flows by affecting the capital accumulation process either directly or via the depreciation rate. See, among others, , , , and for early contributions in this literature. In turn, there are some empirical studies at the sectoral level that have confirmed that capital deterioration is endogenous and, in particular, associated with maintenance expenditure.…”