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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 total cost is given by the sum of setup costs, purchase order cost, stockout cost and inventory carrying cost: (,) = + [(,)] + (,) What changes with this approach is the computation of the optimal reorder point:
Lead time is the delay between the time the reorder point (inventory level which initiates an order [8]) is reached and renewed availability. Service level is the desired probability of meeting demand during the lead time without a stockout. If the service level is increased, the required safety stock increases, as well.
In a base-stock system inventory position is given by on-hand inventory-backorders+orders and since inventory never goes negative, inventory position=r+1. Once an order is placed the base stock level is r+1 and if X≤r+1 there won't be a backorder. The probability that an order does not result in back-order is therefore:
If there are backorders, the reorder point is: =; with m being the largest integer and μ the lead time demand. Additionally, the economic order interval [ 8 ] can be determined from the EOQ and the economic production quantity model (which determines the optimal production quantity) can be determined in a similar fashion.
The critical fractile formula is known as Littlewood's rule in the yield management literature. ... Reorder point – Inventory level triggering replenishment;
Reorder level: Reorder level refers to the point when a company place an order to re-fill the stocks. Reorder point depends on the inventory policy of a company. Some companies place orders when the inventory level is lower than a certain quantity. Some companies place orders periodically.
Demand for items from inventory is continuous and at a constant rate; Production runs to replenish inventory are made at regular intervals; During a production run, the production of items is continuous and at a constant rate; Production set-up/ordering cost is fixed (independent of quantity produced) The lead time is fixed