Practical benefits of environmental evaluation of reusable packaging products with f = 1 & T = 1 are the following: (i) comparative assessment of alternative specific packaging forms fulfilling the same demand (e.g., containers marketing the same products), (ii) environmental monitoring & reporting, ie, tracking of performance trend of specific packaging forms fulfilling the same demand & of the overall packaging material (e.g., glass) & of all packaging materials (glass; metals; paper; plastics; wood) over consecutive years & (iii) implementation of ecological policy via transparent tools. If the systems have the same net imports, that is, if Inet1 = Inet2, or ?Inet = 0, the system with higher ? is associated with lower environmental impacts from production (K3) at steady state, if & only if, its production level, Pe2, remains below a critical level given by Pe2
