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The reorder point (ROP), also reorder level (ROL) or "optimal re-order level", [1] is the level of inventory which triggers an action to replenish that particular inventory. It is a minimum amount of an item which a firm holds in stock, such that, when stock falls to this amount, the item must be reordered.
The single-item EOQ formula finds the minimum point of the following cost function: Total Cost = purchase cost or production cost + ordering cost + holding cost Where: Purchase cost: This is the variable cost of goods: purchase unit price × annual demand quantity. This is .
If the inventory policy is continuous policy (such as an order point-order quantity policy or an order point-order up to policy) the inventory level is continuously monitored and orders are placed with freedom of time. In this case, safety stock is calculated considering the risk of only the replenishment lead time.
Total cost function and optimal reorder point. The total cost is given by the sum of holdings costs and backorders costs: = + It ...
Reorder point; Safety stock; Infinite fill rate for the part being produced: Economic order quantity; Demand is random, continuous replenishment: Base stock model; Demand varies over time: Dynamic lot size model; Several products produced on the same machine: Economic lot scheduling problem
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In inventory theory, the (Q,r) model is used to determine optimal ordering policies. [1] Its is a class of inventory control models that generalize and combine elements of both the Economic Order Quantity (EOQ) model and the base stock model. [2]
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