“…One possible alternative method, which seems consistent with the studied problem, is the activity-based depreciation approach (known also as the units of production method (UPM)) which makes it possible to estimate the depreciable amount of an asset according to its use. According to Palmer and Davis (2004), the time-of-use is the most popular single activity factor prescribed by proponents of activitybased costing (ABC) in machine-intensive environments. However, the units of time are not equal.…”