When to reorder is different from how much to order
An inventory can need a new order while there is still stock on the shelf. The reorder point accounts for what may be used before a delivery arrives; the order quantity answers a separate question about how much to buy. Stock already on order can also matter when deciding whether another order is needed.
Questions you could explore
- Why could looking only at the shelf cause an unnecessary duplicate order?
Start reading
- MIT OpenCourseWare, Center for Transportation and LogisticsInventory Management: Probabilistic Demand
The MIT logistics lecture defines inventory position and a continuous-review policy with a reorder threshold and fixed order quantity.
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