| TDi(j) | total demand of all types in period j being appropriate, according to the PRik parameter, to be satisfied by vehicle i (km, tkm, tone, m3, pallet, liter, …/period of analysis) |
| SMDk(j) | supply meeting demand type k in period j, calculated as the total productivity of all vehicles i being able, according to the PRik parameter, to satisfy demand type k taking into account their engagement to satisfy other demand types – interchangeability of vehicles with demand types k (km, tkm, tone, m3, pallet, liter, …/period of analysis) |
| PRik | productivity range of vehicle i in relation to demand of type k denoting if vehicle i is suitable to satisfy demand of type k (value 1) or not (value 0); PRik {0, 1} (−) |
| Dk(j) | demand of type k in period j, expressed in the same unit measure as Pi(j) (km, tkm, tone, m3, pallet, liter, …/period of analysis) |
| other notations as in Equation (1) | |
| TD | total demand of all types in period |
| SMD | supply meeting demand type |
| productivity range of vehicle | |
| demand of type | |
| other notations as in | |
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