Newsboy Model

The newsboy model is a single-period inventory optimization method for choosing order quantity under uncertain demand when only one order can be placed and leftover units have low salvage value. It balances overstocking cost against understocking cost, determining the optimal stock level that maximizes expected profit or minimizes expected shortage and excess costs.

In a manufacturing environment, the newsboy model applies whenever a material, component, or finished good must be committed before demand is visible and cannot be replenished during the same horizon. Typical cases include promotional runs, seasonal packaging, perishable raw-material lots, end-of-life spare parts, or campaign-driven production. Planners estimate demand from historical consumption, fit a normal or Poisson distribution, and compute the critical ratio as underage cost divided by underage plus overage cost. They then order up to the demand quantile at that ratio, which aligns stock with the target service level or expected profit. In warehousing, the model guides pre-positioning of volatile SKUs, especially in e-commerce fulfillment where holding leftover stock is expensive but stockouts lose margin. It is most valuable for A/B/C parts with non-replenishable windows, where the salvage value of unsold inventory is far below purchase cost and the cost of missing demand is quantifiable.