Hence, for the MB transshipment model a total of 27 shipment variables (r0 plant-wholesaler and 17 wholesaler-retailer routes) are prohibited and thus removed from the LP transshipment model (6.12).In essence, MB's Lp transship- ment model can be considered as the model of (6.12) with the above 27 variables removed. However, in practice we need a generic LP formulation for the transship- ment problem with prohibited routes. Next, we develop a general Lp transshipment model with infeasible routes.