The MULLDC.lng Model Multi-level Distribution View the model Download the model In this model, we minimize shipping costs over a three tiered distribution system consisting of plants, distribution center, and customers. Plants produce multiple products, which are shipped to distribution centers. If a distribution center is used, it incurs a fixed cost. Customers are supplied by a simgle distribution center. Keywords: Demand Backlog | Distribution | Inventory | Network | Product Management | Production | Reorder Point | Shipping | Uncertainty | Geographic