Flexible and Risk-Sharing Supply Contracts Under Price Uncertainty
Management Science
Capacity Acquisition, Subcontracting, and Lot Sizing
Management Science
All-or-Nothing Ordering Under a Capacity Constraint
Operations Research
Optimal Inventory Policy with Two Suppliers
Operations Research
Optimal Commodity Trading with a Capacitated Storage Asset
Management Science
Optimal Inventory Policies when Purchase Price and Demand Are Stochastic
Operations Research
Integrating Long-Term and Short-Term Contracting in Beef Supply Chains
Management Science
Multiechelon Procurement and Distribution Policies for Traded Commodities
Management Science
Integrated Optimization of Procurement, Processing, and Trade of Commodities
Operations Research
Periodic review inventory control with fluctuating purchasing costs
Operations Research Letters
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We consider a stochastic inventory control problem in which a buyer makes procurement decisions while facing periodic random demand and two supply sources, namely, a long-term contract supplier and a spot market. The contract between the buyer and the supplier partially shields the latter from the vicissitudes of the spot market, in that the price paid by the buyer to the supplier is only partially linked to the spot price at the moment. After fulfilling the minimum-order commitment with the supplier, the buyer has the full freedom to source from both the supplier and the market. Procurement from the spot market also incurs a fixed setup cost. We show that an optimal policy consists of three different policy forms, with the realization of each depending on the buyer's inventory level and the prevalent spot price. Certain conditions are identified under which monotone trends exist between policy parameters and the current spot price.