This is a supply chain model of the relationship between a manufacturer and its supplier, modeled from the point of view of the supplier. The manufacturer produces several products with random daily demands. These products require several components from the supplier. The supplier produces these components and stores them at the manufacturer's site so that they are on hand when needed. In turn, the components require several subcomponents. These subcomponents are stored at the supplier's location for use in the components. Production of components and subcomponents is driven by two sets of decision variables, triggers and batch sizes, and the model explores the effects of these.