Within the standard cycle-inventory formulation used for supply-chain lot-sizing decisions, the price paid for each unit is the material cost , conventionally denoted by C . The terminology matters because the principal cost variables in the basic model represent different economic drivers.
Material cost C represents the acquisition value per unit. Fixed ordering cost S represents the cost incurred each time an order or production lot is initiated, irrespective of the quantity in the lot. Inventory holding cost is linked to the value of inventory and the carrying-cost rate over a specified period. In many supply-chain models, annual holding expense per unit is expressed using a carrying-rate relationship involving the unit material cost.
Option D is deliberately plausible because everyday commercial terminology often refers to the amount paid as the “purchase price.” However, the question asks for the defined variable within this particular inventory-model notation. In that framework, C is the material cost.
Correct identification of these variables is necessary when analyzing EOQ, quantity discounts, cycle inventory, and the effect of acquisition value on carrying cost. The exact formulation is also consistently presented in standard supply-chain cycle-inventory question sets.
Reference Topic: Inventory and Warehousing — Inventory Cost Parameters and Lot-Sizing Models.
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